Leonard S. Lilly, MD

• Professor of Medicine, Harvard Medical School, Chief, Brigham and Women's/Faulkner Cardiology, Brigham and Women's Hospital, Boston, Massachusetts

https://connects.catalyst.harvard.edu/Profiles/display/Person/26967

Many patients requiring laparotomy may have had intra-abdominal meshes placed laparoscopically for the treatment of primary ventral hernia arrhythmia recognition poster generic 8 mg aceon with mastercard. Scars from this procedure may be difficult to see as there is no primary incision arteria lingualis order aceon mastercard. However hypertension 24 aceon 2 mg online, these will generate the same issues of concern for the operating surgeon on entry to heart attack demi lovato sam tsui chrissy costanza of atc discount 8 mg aceon overnight delivery, and closure of blood pressure medication common purchase aceon with american express, the abdomen. It is important to look for evidence of this repair, both clinically and in the past surgical history assessment. Most scars will be found laterally toward the mid-axillary line, as a lateral approach to port placement is required to facilitate mesh placement. Similarly, some mesh techniques use a small incision in the skin and the rectus sheath but are used to place large meshes (up to 30 cm) caudally and cephalad undermining the respective layers. They are all treated similarly at repeat laparotomy but knowledge of what might be found and in what layer may help the surgeon, especially if a mesh is unexpectedly encountered. Simple meshes are inert polymers that form a matrix for intense fibrosis to strengthen a repair. They cause a local reaction that changes the nature of the underlying and overlying tissues, and the subsequent fibrosis (characterized by an intense white reaction) reinforces what would otherwise be a weak repair. They are generally used for repairs where the mesh is placed outside the peritoneum because of concerns of mesh enterocutaneous fistulation or adhesive small bowel obstruction. Component meshes were conceived to combat this problem and allow intraperitoneal placement to facilitate repairs where mesh could not be placed outside the peritoneal cavity. These usually comprise one of the simple polymers but have a specialist layer that is hydrophilic in nature and safer in contact with bowel. It is important to remember that these meshes are designed to facilitate regeneration of the peritoneum, with a full covering within 2 weeks. Subsequently, they can be difficult to see if the abdomen is opened away from the hernia site repair. Their use is increasing as they offer a solution to incisional hernia repairs in cases where the risk of infection is very high. Surgical techniques It is not necessary to know the intimate details of all types of repairs but some fundamental knowledge will help the operating gynecologist react to , and manage, patients with a previous mesh insertion. Whether the mesh is placed laparoscopically or via open surgery is largely irrelevant, but all laparoscopic meshes are placed within the abdomen and normally fixed with a combination of sutures and tacking devices. In general, large meshes are used to obtain a greater than 5-cm overlap of the defects to reduce recurrence. A common eponymous description is the Stoppa repair, which puts mesh over a closed posterior sheath. The layer in which the mesh is placed determines when it will be met on entry to the abdomen. If biological meshes are used, these can be difficult to determine as most are incorporated into existing tissues after remodeling. Management Surgical technique for entry to the abdomen It is important that the operating surgeon should make every effort to establish the nature of the previous repair(s) before surgery is undertaken. As illustrated, previous mesh repairs can be a surgical challenge and help from a general surgeon or an experienced colleague is advisable. Adhesions are common and mobilizing small bowel can be time-consuming and demanding. The basic principles of entry apply to previous mesh repairs or any previous laparotomy incision. The mesh will normally appear as a normal layer and can be cut with a knife or diathermy. Carefully dissect off any adherent bowel or omentum in the midline, working down the wound in section to allow all layers to be opened fully. Closure of the abdominal wall There is a paucity of evidence to direct an evidence-based approach to closure of the abdominal wall. The incision in the case history was closed routinely with mass closure using a non-absorbable suture to facilitate a lasting repair to hold the mesh together. In patients with gross contamination, an assessment of mesh removal versus routine closure should be made. Mesh can be difficult to remove and adding extensive dissection to an already long operation may confer little benefit and create more problems than it solves. If there is concern over closing the abdominal wall after mesh removal, a biological mesh can be inserted. The general surgeon may be of help in these scenarios, not only surgically but also in the decision-making process and the governance issues. A commitment to understanding previous surgical intervention and assessment of the potential pitfalls preoperatively is essential. This will enable a general surgeon to be involved if the clinician feels this is indicated. The impact of a mesh can be very variable, ranging from cases where the operating surgeon is unaware when mesh has been dissected through, to the cases discussed here where careful dissection is required for a safe outcome. Key poIntS Challenge: Patient with previous mesh incisional hernia repair requiring a laparotomy. Prevention · Aim to determine what type of repair has been undertaken and what mesh was used. Management · Keep to the basic surgical principles of entry into an abdomen with previous surgery (Chapter 27): · If possible, enter in a virginal section of the abdomen, either open or laparoscopically. In grossly contaminated cases, consider mesh removal but assess benefits with general surgeon before committing the patient to extensive dissection to remove the mesh. Demographic and socioeconomic aspects of hernia repair in the United States in 2003. Unacceptable results of the Mayo procedure for repair of abdominal incisional hernias. Analysing the benefits of laparoscopic hernia repair compared to open repair: a meta-analysis of observational studies. Laparoscopic versus open surgical techniques for ventral or incisional hernia repair. Chapter 29 patient with previous Mesh Incisional hernia repair requiring a Laparoscopy Emanuele Lo Menzo, Samuel Szomstein, and Raul J. She now presents with recurrent episodes of small bowel obstruction resolving with non-operative treatment. Because of the multiple and close recurrent episodes, the patient was offered a diagnostic laparoscopy. Background Incisional hernias are a frequent complication of abdominal surgery and they occur in up to 20% of laparotomies [1,2]. Since up to 65% of ventral hernias repaired primarily will recur, tension-free repair with the use of mesh is now considered the standard of care for defects greater than 3­4 cm [3]. It is thus obvious that abdominal explorations in patients with previous mesh have become more prevalent. For the safe laparoscopic approach of abdomens with previous mesh, a knowledge of the size, location and, if possible, the type of mesh (Chapter 28) would be beneficial. Access can be gained by either open approach (Hasson technique), blind Veress needle insufflation, or by direct visualization of the abdominal wall layers via optical trocars. In general the subcostal areas are safer choices for access, as adhesions are less common in these areas. Although access with the Veress techniques has been proven to be safe, our preference is to utilize either the open Hasson technique or the optical trocar method, especially in obese individuals [4,5]. If access through the mesh is required, then an open technique with division of the mesh is the only option. Careful digital exploration would follow prior Management patient positioning the patient is positioned supine with all the pressure points adequately padded. Preoperative antibiotics are administered within 30 min of the incision and usually consist of a first- or secondgeneration cephalosporin. If both the operator and the assistant are expected to be working from the same side of the patient, the ipsilateral arm should be tucked along the body. The monitor is aligned with the targeted area and triangulation of the trocars and optics should be maintained whenever possible. Working against the camera should be avoided to ensure optimal dexterity, and angle laparoscopes (30 or 45°) are used to allow different views of the adhesions, in order to minimize bleeding and enterotomies. Essential laparoscopic instruments include atraumatic graspers, scissors, and energy sources (diathermy and ultrasonic energy). Whenever good mesh incorporation is found, and in the setting of lack of contamination, the old mesh can be simply reapproximated at the end of the procedure. Insertion of the additional trocars should always be done under direct visualization, and in order to facilitate identification of the trajectory of the trocar a 14-gauge needle can be introduced through the abdominal wall. Lysis of adhesions Laparoscopic lysis of adhesions is feasible even in the presence of a small bowel obstruction as long as there is no massive abdominal distension limiting access to the abdominal cavity or limiting adequate working space. The laparoscopic approach is also indicated provided that there is no frank peritonitis, hemodynamic instability, or cardiopulmonary morbidity precluding the use of pneumoperitoneum [4]. The technique of the adhesiolysis should be tailored to the type of adhesions encountered. Fine filmy adhesions are easily approached with both blunt and sharp dissection, whereas the densely vascularized ones might require an energy source to limit bleeding obscuring the tissue planes; great care should be taken when applying thermal energy in proximity to bowel. In fact, electrical injury to the bowel can manifest itself several days after the procedure. The entire tip of the instruments should be in view at all times in order to avoid unwanted injuries, and if the tips of the scissors can be visualized through the adhesions, these can be safely cut. Whenever the anatomy is unclear, changing the angle of view of the camera can help in better visualizing the loops of bowels. The challenges of laparoscopic adhesiolysis are determined by the lack of free space to place working trocars, limited visualization, and presence of dense adhesions [4]. If the mesh­bowel interface is too densely adherent and separation might result in enterotomy, portions of the mesh can be detached from the abdominal wall and left on the bowel serosa, provided no evidence of erosion or obstruction is present. Serosal tears should be promptly addressed and repaired with interrupted serosal apposition including the submucosal layer (Lembert sutures). Whenever a bowel loop is severely damaged or the repair might lead to a stricture, resection and re-anastomosis should be carried out. The latter can be delayed until the entire lysis of adhesions is completed, in order to address all the questionable area at the same time. It is recommended to mark the questionable areas as encountered, in order to avoid missing some of them and to expedite the evaluation at the end of the adhesiolysis. Depending on the skills of the surgeon, bowel repairs and resections can be accomplished laparoscopically or by limited laparotomies. Secondly, laparoscopy has also been well established in decreasing the incidence of wound infection and postoperative pulmonary complications and shortening hospital stay because of a more rapid return of bowel function and decreased postoperative pain [7]. Mechanical and pharmacologic prophylaxis of deep vein thrombosis is routinely used in the perioperative period, and is continued based on the individual risk factors of the patient. If extensive adhesiolysis or small bowel resection has been performed, nasogastric decompression is warranted until signs of bowel function recovery. Any delays in the normal postoperative recovery, unexplained elevation of the white cell count, or fever should be promptly worked up. In the setting of clinical deterioration, with or without pertinent physical signs, early diagnostic exploration might be warranted. In fact, the sooner the enterotomy or anastomotic leak is diagnosed, the more favorable the outcome. In the presence of small bowel enterotomy or small bowel anastomotic leak, resection with primary anastomosis is usually possible. Only in cases of hemodynamic instability and extensive fecal contamination should diverting ostomies be considered. In the latter scenario, meshes well incorporated to the abdominal wall can be left in situ, whereas if fecal contamination exists near exposed meshes, removal of the mesh is imperative. The subsequent abdominal wall closure becomes challenging and should be accomplished by primary technique (with or without fascial release) or by using biologic materials. As a last resort, temporary abdominal wall closure techniques can be performed with the intent of returning to the operating room for washouts and definitive closure in the following 24­48 hours. Care must be taken during the initial abdominal wall entry, with preference for the bilateral subcostal areas or a non-meshed site. The laparoscopic lysis of adhesions has to proceed in a standardized fashion, maximizing traction and counter-traction to expose planes of dissection. In the majority of cases sharp and blunt dissection is used, and energy sources should be used sparingly and away from bowel. Any derangement from the standard postoperative recovery necessitates prompt work-up and even re-exploration if clinically warranted. Background · Incisional hernias are a frequent complication of abdominal surgery and occur in up to 20% of laparotomies. Prevention · Care is needed during initial abdominal entry, preference being given to the bilateral subcostal areas or a non-meshed site. Longterm follow-up of a randomized controlled trial of suture versus mesh repair of incisional hernia. Laparoscopic adhesiolysis for recurrent small bowel obstruction: long-term follow-up. Does means of access affect the incidence of small bowel obstruction and ventral hernia after bowel resection Case history 2: A 50-year-old woman presents with abdominal pain and constipation for over 1 week. Ultrasound scan shows small bilateral ovarian cysts and large bowel loaded with feces.

The sympathetic division of the autonomic nervous system regulates the secretion of adrenal medullary hormones blood pressure treatment guidelines aceon 4 mg buy low cost. They are secreted whenever the body is under stress blood pressure 4 year old 8 mg aceon purchase with amex, and they duplicate the action of the sympathetic division on a bodywide scale blood pressure chart runners order 2 mg aceon amex. The medullary hormones have a stronger and longer-lasting effect in preparing the body for "fight or flight blood pressure chart diagram buy discount aceon 8 mg line. Epinephrine and norepinephrine are particularly important in short-term stress situations pulse pressure 57 purchase aceon cheap online. In times of chronic stress the adrenal cortex makes further adjustment as will be discussed in the next section. Hormones of the Adrenal Cortex Several different steroid hormones are produced by the adrenal cortex, but the most important ones are aldosterone, cortisol, and the sex hormones. Aldosterone (al-do-ster -on) is the most important mineralocorticoid secreted by the adrenal cortex. Mineralocorticoids regulate the concentration of electrolytes (mineral ions) in body fluids. Aldosterone stimulates the kidneys to retain sodium ions (Na+) and to excrete potassium ions (K+). This action not only maintains the normal balance of Na+ and K+ in body fluids but also maintains blood volume and blood pressure. And it causes water to be reabsorbed by osmosis, which maintains blood volume and blood pressure. This is important because carbohydrate sources, such as glycogen, may be exhausted after several hours without food or strenuous exercise. The Part 3 Integration and Control 233 Clinical Insight Everyone experiences stressful situations. Stress may be caused by physical or psychological stimuli that are perceived as threatening. Whereas mild stress can stimulate creativity and productivity, severe and prolonged stress can have serious consequences. When stress occurs, the hypothalamus activates the sympathetic division of the autonomic nervous system and the secretion of epinephrine and norepinephrine by the adrenal medulla. Thus, both neural and hormonal activity prepare the body to meet the stressful situation by increasing blood glucose, heart rate, breathing rate, blood pressure, and blood flow to the muscular and nervous systems. Glucocorticoids increase the levels of amino acids and fatty acids in the blood and promote the formation of additional glucose from noncarbohydrate nutrients. All of these responses prepare the body for an immediate response to cope with a stressful situation. Prolonged stress may cause several undesirable side effects from the constant secretion of large amounts of epinephrine and glucocorticoids, such as decreased immunity and high blood pressure- problems that are common in our society. How do secretions of the adrenal medulla prepare the body to react in emergencies The pancreas (pan -kre-as) is an elongate organ that is ¯ located posterior to the stomach (figure 10. Its exocrine functions are performed by secretory cells that secrete digestive enzymes into tiny ducts within the gland. These ducts merge to form the pancreatic duct, which carries the secretions into the small intestine. Its endocrine functions are performed by secretory cells that are arranged in clusters or clumps called the pancreatic islets. Glucagon androgens promote the early development of male reproductive organs, but in adult males their effects are masked by sex hormones produced by testes. This syndrome is characterized by high blood pressure, an abnormally high blood glucose level, protein loss, osteoporosis, fat accumulation on the trunk, fatigue, edema, and decreased immunity. A person with this condition tends to have a full, round face and an enlarged abdomen. It is characterized by low blood Glucagon (glu -kah-gon) increases the concentration of ¯ glucose in the blood. It does this by activating the liver to convert glycogen and certain noncarbohydrates, such as amino acids, into glucose. Glucagon helps to maintain the blood level of glucose within normal limits even when carbohydrates are depleted due to long intervals between meals. Glucagon secretion is controlled by the blood level of glucose via a negative-feedback mechanism. A low level of blood glucose stimulates glucagon secretion, and a high level of blood glucose inhibits glucagon secretion. Clinical Insight Persons with inflamed joints often receive injections of cortisone, a glucocorticoid, to temporarily reduce inflammation and the associated pain. The hormone-secreting alpha and beta cells are grouped in clusters, called pancreatic islets. Part 3 Integration and Control 235 Insulin the effect of insulin on the level of blood glucose is opposite that of glucagon. Insulin decreases blood glucose by aiding the movement of glucose into body cells, where it can be used as a source of energy. Without insulin, glucose is not readily available to most cells for cellular respiration. High blood glucose levels stimulate insulin secretion; low levels inhibit insulin secretion. Type I or insulin-dependent diabetes is an autoimmune metabolic disorder that usually appears in persons less than 20 years of age. For this reason, it is sometimes called juvenile diabetes, although the condition persists for life. Type I diabetes results when the immune response destroys the beta cells in pancreatic islets. Because the metabolism of carbohydrates, fats, and proteins is affected, persons with type I diabetes must follow a restrictive diet. They must also check their blood glucose level several times a day and inject themselves with insulin, or receive insulin from an implanted insulin pump, to keep their blood glucose concentration within normal limits. Negativefeedback mechanism responding to blood glucose level controls the secretion of both hormones. This form of diabetes, also called adult-onset diabetes, usually appears after 40 years of age in persons who are overweight. The symptoms are less severe than in type I diabetes and can be controlled by a careful diet and oral medications that help regulate blood levels of glucose. In either case, the result is hyperglycemia, excessively high levels of glucose in the blood. With insufficient insulin or a reduction in target insulin receptors, glucose cannot get into cells easily, and cells must rely more heavily on triglycerides as an energy source for cellular respiration. The products of this reaction tend to decrease blood pH (acidosis), which can inactivate vital enzymes and may lead to death. An excessive production of insulin, or overdose of insulin, may lead to hypoglycemia, a condition characterized by excessively low blood glucose levels. Symptoms include acute fatigue, weakness, increased irritability, and restlessness. Estrogens (es -tro-jens), the primary female sex hormones, are several related compounds that are secreted by developing ovarian follicles that also contain an oocyte (developing egg). Estrogens stimulate the development and maturation of the female reproductive organs and the secondary sex characteristics. They also help to grow and maintain the uterine lining (endometrium) to support a pregnancy. Progesterone (pro-jes -te-ron) is secreted by the corpus luteum, a gland that forms from the empty ovarian follicle after the oocyte has been released by ovulation. It helps prepare the uterus for receiving a preembryo and maintains the pregnancy. They not only produce oocytes and sperm, respectively, Male Sex Hormone the testes are paired, ovoid organs located inferior to the pelvic cavity in the scrotum, a sac of skin located posterior to the penis. The seminiferous tubules of the testes produce sperm, the male sex cell; and the interstitial cells (cells between the tubules) secrete the male hormone testosterone (tes-tos -te-ron). Testosterone stimulates the development and maturation of the male reproductive organs, the secondary sex characteristics. There are a few other glands and tissues of the body that secrete hormones and are part of the endocrine system. These include the pineal gland, the thymus, the kidneys, the heart, and certain small glands in the lining of the stomach and small intestine. Hormones released from the kidneys, heart, and digestive system will be covered in their respective chapters. In addition, the placenta is an important temporary endocrine organ during pregnancy. When exposed to light, nerve impulses from the retinas of the eyes are sent to the pineal gland, causing a decrease in melatonin production. During darkness, these nerve impulses decrease, and melatonin secretion is increased. Secretion is greatest at night and lowest in the day, which keeps our sleep­wakefulness cycle in harmony with the day­night cycle. As frequent fliers know, jet lag results when the sleep­ wakefulness cycles are out of sync with the day­night cycle. Jet lag can be more quickly reversed by exposure to bright light with wavelengths similar to sunlight, because the melatonin cycle is resynchronized to the new day­night cycle. It is large in infants and children but it shrinks with age and is greatly reduced in adults. It plays a crucial role in the development of immunity, which is discussed in chapter 13. The thymus produces several hormones, collectively called thymosins (thi-mo -sins), which are involved in the maturation of T lymphocytes, a type of white blood cell. Pineal Gland the pineal (pin -e-al) gland is a small, cone-shaped nodule ¯ of endocrine tissue that is located in the epithalamus of the brain near the roof of the third ventricle. It secretes the hormone melatonin (mel-ah-to -nin), which seems to inhibit ¯ the secretion of gonadotropins and may help control the onset of puberty. Melatonin seems to regulate wake­sleep Chapter Summary · the endocrine system is composed of hormone-secreting cells, tissues, and organs. They are formed by most body cells and have a distinctly local (paracrine) effect. The negative-feedback mechanisms of hormone production work one of three ways: (1) hormonal, (2) neural, and (3) humoral. Endocrine disorders are associated with severe hyposecretion or hypersecretion of various hormones. The releasing and inhibiting hormones regulate the secretion of anterior lobe hormones. Each · gland consists of two parts: a deep adrenal medulla and a superficial adrenal cortex. The adrenal medulla secretes epinephrine and norepinephrine, which prepare the body to deal with emergency situations. They increase the heart rate, circulation to nervous and muscular systems, and glucose level in the blood. The adrenal cortex secretes a number of hormones that are classified as mineralocorticoids, glucocorticoids, and androgens. It helps to regulate the concentration of electrolytes in the blood, especially sodium and potassium ions, which increases blood pressure. It promotes the formation of glucose from noncarbohydrate sources and inhibits inflammation. They have little effect in adult males but contribute to the sex drive in adult females. Glucagon, from the alpha cells, increases the level of blood glucose by stimulating the liver to form glucose from glycogen and some noncarbohydrate sources. Insulin, from the beta cells, decreases the level of blood glucose by aiding the movement of glucose into cells. The antagonistic functions of glucagon and insulin keep the level of blood glucose within normal limits. Hyposecretion of insulin or a decrease in the number of insulin receptors causes diabetes mellitus. Calcitonin decreases the level of blood Ca2+ by promoting Ca2+ deposition in bones. Hyposecretion of thyroid hormones in infants and children causes cretinism; in adults, it causes myxedema. Parathyroid hormone increases the level of blood Ca2+ by promoting Ca2+ removal from bones, Ca2+ absorption from the intestine, and Ca2+ retention by the kidneys. Parathyroid hormone and calcitonin work antagonistically to regulate blood Ca2+ levels. Estrogens also help to prepare the uterus for a preembryo and help to maintain pregnancy. It prepares the uterus for the preembryo, maintains pregnancy, and prepares the mammary glands for milk production. It secretes thymosins, which are involved in the maturation of white blood cells called T lymphocytes. Chemical coordination of body functions is the function of the system, whose glands secrete that serve as chemical messengers. The secretion of pituitary hormones is regulated by a part of the brain called the. The pituitary gland secretes four hormones that regulate secretion of other endocrine glands. The concentration of Ca2+ in the blood is regulated by two hormones with antagonistic actions: promotes Ca2+ deposition in bones; promotes Ca2+ removal from bones. Some hormones affect many widely distributed cells in the body but others affect relatively few, localized cells.

The left and right common iliac veins merge to form the inferior vena cava hypertension young women 4 mg aceon buy with amex, which returns blood to the right atrium of the heart (see figure 12 blood pressure normal reading aceon 8 mg buy low price. Clinical Insight the median cubital vein is the vein of choice when drawing a sample of blood for clinical tests quick acting blood pressure medication aceon 2 mg without prescription. It is easily located just deep to the skin on the anterior surface of the elbow joint hypertension with stage v renal disease order genuine aceon online. In coronary bypass surgery blood pressure dehydration purchase 2 mg aceon visa, a segment of the internal thoracic artery, saphenous vein, or radial artery is grafted to the afflicted coronary artery on each side of the blockage. The subclavian vein is a common site for implanting the central line, a long-term catheter for administering medications and taking blood samples. What is the venous pathway of blood from the left side of the head to the right atrium What is the venous pathway of blood from the posterior portion of the ankle to the right atrium These disorders are grouped according to whether they affect primarily the heart or the blood vessels. In some cases, the underlying cause of a heart ailment is a blood vessel disorder. It results from calcium deposits that accumulate in the tunica media of arterial walls and is usually associated with atherosclerosis. Atherosclerosis is the formation of fatty deposits (cholesterol and triglycerides) along the tunica intima of arterial walls. The atherosclerotic plaques reduce the lumen of the arteries and increase the probability of blood clots being formed. Such deposits in the coronary, carotid, or cerebral arteries may lead to serious circulatory problems (figure 12. Heart Disorders Arrhythmia (ah-rith -m¯-ah), or dysrhythmia, refers to an e abnormal heartbeat. It may be caused by a number of factors, including damage to the heart conduction system, drugs, electrolyte imbalance, or a diminished supply of blood via the coronary arteries. In addition to irregular heartbeats, arrhythmia includes · Bradycardia-a slow heart rate of less than 60 beats per minute. Note that the bradycardia in welltrained athletes is a healthy condition because it saves energy during resting heart contraction and has a greater potential to increase cardiac output. Symptoms include fatigue; edema (accumulation of fluid) of the lungs, feet, and legs; and excess accumulation of blood in internal organs. They are usually associated with defective heart valves, which allow a backflow of blood. The obstruction is usually a blood clot that has formed as a result of atherosclerosis. This event is commonly called a "heart attack," and it may be fatal if a large portion of the myocardium is deprived of blood. Pericarditis is the inflammation of the pericardium and is usually caused by a viral or bacterial infection. It may be quite painful as the inflamed membranes rub together during each heart cycle. Part 4 Maintenance of the Body 287 Hypertension refers to chronic high blood pressure. A systolic blood pressure of 120 to 139 mm Hg and a diastolic blood pressure of 80 to 89 mm Hg is considered to be prehypertension. Hypertension may be caused by a variety of factors, but persistent stress and smoking are commonly involved. If it is complicated by the formation of a blood clot, it is called thrombophlebitis. Varicose veins are veins that have become dilated and swollen because their valves are not functioning properly. Pregnancy, standing for prolonged periods, and lack of physical activity reduce venous return and promote varicose veins in the lower limbs. Chronic constipation promotes their occurrence in the anal canal, where they are called hemorrhoids (hem o-royds). It is lined internally by the thin endocardium and externally by the thin epicardium. The superior chambers are the left and right atria, which receive blood returning to the heart. The inferior chambers are the left and right ventricles, which pump blood out of the heart. At the same time, the left ventricle pumps oxygenated blood into the aorta, which leads to all parts of the body except the lungs. Blood is returned from the myocardium by the cardiac veins, which open into the coronary sinus, which leads to the right atrium. Ventricular systole pumps blood from the ventricles into their associated arteries. An electrocardiogram is a recording of the formation and transmission of impulses through the heart conduction system. It receives sensory nerve impulses from baroreceptors and chemoreceptors, and is also affected by nerve impulses from the cerebrum and hypothalamus. Parasympathetic axons release acetylcholine at heart synapses, which causes a decrease in heart rate. Blood pressure is determined by three factors: cardiac output, blood volume, and peripheral resistance. The vasomotor center in the medulla oblongata provides the autonomic control of blood vessel diameter. In this way, the autonomic nervous system controls peripheral resistance and blood pressure. Local autoregulation of arterioles overrides autonomic control and regulates blood flow in capillaries according to the needs of the local tissues. Large arteries and veins are formed of a superficial tunica externa of dense irregular connective tissue, a middle tunica media of smooth muscle, and a deep tunica intima of endothelium supported by areolar connective tissues. Large arteries divide repeatedly to form the smallest arteries, arterioles, which connect with capillaries. They are composed of an endothelium supported by a layer of areolar connective tissue. Their thin walls allow an exchange of materials between the blood and the interstitial fluid. Fluid exits the arteriolar end of a capillary because blood pressure is greater than osmotic pressure, and it reenters at the venular end of the capillary because osmotic pressure is greater than blood pressure. Veins have thinner walls than arteries and carry blood from capillaries toward the heart. The smallest veins are venules, which lead from capillaries and merge to form small veins. Each common carotid artery branches to form the external and internal carotid arteries. Each shoulder and upper limb is supplied by a subclavian artery, which becomes the axillary artery, which becomes the brachial artery of the arm. The brachial artery branches to form the radial and ulnar arteries of the forearm. The external iliac enters the thigh to become the femoral artery, which becomes the popliteal artery near the knee. The popliteal branches inferior to the knee to form the anterior and posterior tibial arteries. Systemic blood pressure declines as blood is carried from the arteries through the capillaries and through the veins. Skeletal muscle contractions and respiratory movements are important forces that aid the return of venous blood. Blood velocity varies inversely with the cross-sectional area of the combined blood vessels. The velocity progressively increases as the blood flows from capillaries to the larger veins. On each side, the external jugular and vertebral veins empty into the subclavian vein. The ascending lumbar veins and the posterior intercostal veins enter the azygos vein, which opens into the superior vena cava. The basilic vein joins the brachial vein to form the axillary vein, which, in turn, receives the cephalic vein to form the subclavian vein. The popliteal vein receives the small saphenous and fibular veins to form the femoral vein. The great saphenous vein extends from the foot to join with the femoral vein near the hip, which forms the external iliac vein. The external iliac vein joins with the internal iliac vein to form the common iliac vein. The right ovarian or testicular vein and the paired renal veins empty into the inferior vena cava. During diastole blood fills the atria; during ventricular blood is pumped into arteries leading from the heart. Nerve impulses from axons increase the heart rate; nerve impulses from the axons decrease the heart rate. The exchange of materials between capillary blood and interstitial fluid occurs by and. The heart chambers and vessels in the pulmonary circuit are ventricle, pulmonary, pulmonary, alveolar capillaries, pulmonary, atrium. The arterial pathway of blood from the heart to the right side of the brain is ascending aorta, aortic arch, common carotid, and. The arterial pathway of blood from the heart to the liver is ascending aorta, aortic arch, aorta, abdominal aorta, and. The venous pathway returning blood from the digestive tract to the heart is, liver, and vena cava. The venous pathway returning blood from the posterior of the knee is, femoral, and vena cava. The venous pathway from the little finger to the heart is basilic, and vena cava. Recently, several contagious diseases have begun to circulate through the people in her office. She and her twelve coworkers share printers, a water cooler, and a small kitchen space. It is easy to pass a viral or bacterial infection to another person if you are not careful. After suffering for almost two weeks with the flu last year, Adele was proactive regarding her health this year. She went to the local pharmacy a few months ago and received her flu and pneumonia vaccinations. Thanks to the vaccinations, her body now possesses defensive cells, called lymphocytes, to defend her against both diseases if she encounters them. However, these new lymphocytes will defend her against only the strains of flu and bacterial pneumonia in the vaccinations. As she begins to shiver slightly from a fever that has begun to develop, she now hopes that she has not been exposed to a new strain of flu or bacterial pneumonia, against which she will have no defense. Antibody (anti = against) A protein produced by plasma cells in response to a specific antigen. Inflammation (inflam = to set on fire) A localized response to damaged or infected tissues that is characterized by swelling, redness, pain, and heat. Lymph (lymph = clear water) the fluid connective tissue transported in lymphatic vessels. Red bone marrow Primary lymphoid organ responsible for the production of all formed elements. A network of lymphatic vessels drains excess interstitial fluid (the approximate 10­15% that has not been returned directly to the blood capillaries) and Lymphatic capillaries returns it to the bloodstream in a one-way flow that moves slowly toward the subclavian veins. The lymphatic network of vessels begins with the microscopic lymphatic capillaries. Lymphatic capillaries are closed-ended tubes that form vast networks in the interstitial spaces within most vascular tissues (figure 13. Because the walls of lymphatic capillaries are composed of endothelial cells with unique junctions, interstitial fluid, proteins, and microorganisms can easily enter the vessels but cannot leave and reenter the interstitial space. Once fluid enters the lymphatic capillaries, it becomes a fluid connective tissue referred to as lymph (limf). It results from either too much fluid exiting the blood in capillaries or insufficient removal of fluid by lymphatic vessels. For example, a sedentary lifestyle, which leads to the breakdown of valves in lower limb veins, can result in edema of the lower limbs. Also, removal of lymphatic vessels and lymph nodes during cancer surgery often leads to edema of the affected area. Describe the locations and functions of the red bone marrow, thymus, lymph nodes, and spleen. After production in the red bone marrow most lymphocytes and other immune cells go to secondary lymphoid organs, such as the lymph nodes and spleen that become the sites of proliferation of lymphocytes and immune responses. These lymphatic vessels merge into even larger vessels called lymphatic trunks that are named after large body regions (figure 13. The pressure that keeps the lymph moving comes from the massaging action produced by skeletal muscle contractions, intestinal movements, respiratory pressure changes (the same venous return mechanisms described in chapter 12), and from peristaltic contractions of some lymphatic vessels.

Minimally invasive surgical approaches should be adopted where possible blood pressure lisinopril order aceon 8 mg amex, even if this necessitates referral to specialist centers blood pressure chart guide cheap aceon 2 mg. If laparotomy is undertaken 4 discount aceon 2 mg, broad-spectrum antibiotics should be used to reduce the likelihood of wound contamination; transverse incisions are preferable to midline approaches and mass closure is preferable to layered closure [4] blood pressure control chart order aceon online now. Removal of sutures before day 4 of a transverse incision after cesarean section may increase the risk of wound separation [6] hypertension grades aceon 4 mg purchase on-line. Postoperatively, interventions to minimize the risk of developing pneumonia and wound infection are key considerations and these include regular postoperative review, physiotherapy, early mobilization, and recourse to antibiotics when infection is suspected. On discharge, women should be advised to avoid placing undue stress on the incision, to avoid constipation, and to avoid heavy lifting. Background · Wound dehiscence is the separating or "bursting" open of a wound along the surgical suture line, and complicates around 1% of laparotomies. Other risk factors are: · Patient factors: age >45 years, smoking, obesity, pulmonary disease, renal disease, liver disease (ascites, jaundice), anemia, and malnutrition. Antibiotics should be administered according to wound culture results, and regular wound review and dressing changes are needed. Management · Superficial wound dehiscence can often be managed without recourse to further surgery in an operating room: · Explore the wound gently. Prevention · Preoperative work-up should identify women at increased risk of wound dehiscence by identifying known risk factors; interventions to correct or minimize the impact of these variables should be instigated. Management of abdominal wound dehiscence using vacuum assisted closure in patients with compromised healing. Chapter 49 Late Wound Failure: Incisional hernia Saloney Nazeer Geneva Foundation for Medical Education and Research, World Health Organization Collaborating Center in Education and Research in Human Reproduction, Geneva, Switzerland Case history 1: One year after a cesarean section, a woman presented with severe lower abdominal pain. Diagnostic laparoscopy showed a hernia defect at the Pfannenstiel incision between the rectus abdominis muscle and anterior rectus sheath. Case history 2: A 55yearold woman presented with abdominal distension and pain accompanied by nausea and vomiting 6 months after undergoing laparoscopic bilateral salpingooophorectomy. Management Incisional hernia repair is associated with significant risk of morbidity and mortality, with reported mortality of elective hernia repair of up to 5. Background the incidence of incisional hernias is reported to be 2­19% for various abdominal incisions. Transverse, oblique, and paramedian incisions cause significantly less incisional hernias when compared with midline incisions, with a reported occurrence of 1% for transverse incisions (Case history 1) as compared with 14% for the midline incisions [1]. The reasons for high incisional hernia rate after midline laparotomy include the contraction of abdominal wall muscles retracting wound edges laterally, the avascular nature of the midline incision, and perpendicular cutting of most of the fibers of the linea alba. Incisional hernias are a rare complication of laparoscopic surgery, with a reported incidence of less than 1%. The reported incidence of trocarsite hernia in diagnostic laparoscopic procedures is approximately 0. The risk factors for postoperative hernia are large trocar size, leaving the fascial defect open, and stretching of the port site. Large surveys reporting trocarsite hernias for port sizes less than 8 mm and published case reports describing 5mm portsite hernias have led some to recommend routine fascial closure when there has been extensive operative manipulation [2]. The main indication for incisional hernia repair is symptoms such as discomfort, pain, and cosmetic complaints. Other indications include the complications associated with untreated incisional hernia, namely visceral incarceration or strangulation, dystrophic skin ulcer at the hernial site, or rupture of hernial sac and impairment of respiratory function. In view of the postoperative risks (infection, adhesions, recurrence, and death), it is generally recommended that monitoring instead of surgical repair be considered for most patients with asymptomatic incisional hernia. In patients unfit for surgery or the elderly, incisional hernias may be treated conservatively using supports such as trusses or belts [4]. Surgical technique Two surgical approaches are used to treat incisional hernias: conventional open repair or laparoscopic incisional herniorrhaphy. No single technique is the best solution and the choice is indicated by the location and type of defect and the skill of the surgeon. As a rule, large incisional hernias (10 cm) are best repaired by the open technique, as are cases with visceral incarceration or strangulation [4]. Extremely obese patients may also require an open procedure because deeper layers of fatty tissue will have to be removed from the abdominal wall. Another advantage of the open technique is the treatment of loss of domain with component separation and restoration of abdominal wall anatomy and function, hence reducing the risk of abdominal compartment syndrome. For the open procedure the traditional suture repair carries a two to three times greater risk of recurrence than the mesh repair (43% vs. The mesh can be placed using three techniques: onlay (prefascial), sublay (retromuscular, i. The onlay and sublay are the recommended techniques because of lower morbidity and recurrence rates (4. A Cochrane review concluded that there was insufficient evidence to show advantage of a particular open technique [5]. The inlay technique, also used with laparoscopic repair, has the disadvantages of inability to restore anatomy and physiology of the abdominal wall, and exposure of viscera to the mesh requiring use of an expensive mesh with inner nonadhesive coating. The laparoscopic repair approach requires placement of three or more ports inserted away from the hernia site. An intraperitoneal mesh is usually secured by sutures to the abdominal wall (Case history 2). The advantages of the laparoscopic approach include less postoperative complications and reduced hospital stay. The recurrence rate is reported to be 3­15% depending on the experience of the operator [4]. The skin at the surgical site should be prepared immediately before incision using an aqueous or alcoholbased antiseptic preparation (povidoneiodine or chlorhexidine). At the end of operation, the surgical incision should be covered with an appropriate interactive dressing. Intraoperative measures Appropriate selection of operative technique and incision A significant reduction in incisional hernia can be achieved by using unilateral transverse incisions for small unilateral surgeries and selecting lateral paramedian incisions for most major elective surgeries [1]. The midline incision should be reserved for emergency or exploratory surgery, as it is quicker and allows broader access. Suture material and suture technique the choice of suture material for abdominal closure remains controversial. Evidence from randomized clinical trials and metaanalysis shows that continuous running nonabsorbable or slowly absorbable suture is the method of choice for abdominal wall closure [7]. Closure of fascial layers Based on emerging clinical evidence, routine closure of fascia is now recommended for laparoscopic ports greater than 10 mm and for 5mm ports with extensive operative manipulation [2]. Choice of mesh At present, the data comparing the clinical advantages of lightweight mesh with standardweight mesh are limited. Similarly, limited experience exists to define the indications for biologic meshes as opposed to use of surgical steel or polypropylene mesh. To prevent risk of recurrence at the edges of the mesh, the mesh must overlap the hernial defect by several centimeters. Based on estimated mesh shrinkage from animal studies, it is recommended that a 3­5 cm overlap for open repair with complete fascial closure, and a 3cm overlap for laparoscopic repair, is sufficient [4]. Prevention (of complications) Lose weight; maintain suitable weight for height and age. Management (of incisional hernia) · A careful decision on whether to repair needs to be made; asymptomatic incisional hernias may not need to be repaired. A multicenter randomized controlled trial evaluating the effect of small stitches on the incidence of incisional hernia in midline incisions. Incisional hernia after abdominal closure with slowly absorbable versus fast absorbable, antibacterialcoated sutures. On clinical examination erythema and edema of the abdominal wall are noted, as well as livid discoloration of the suture line and blistering of the skin adjacent to the wound. The patient quickly deteriorates, becoming hemodynamically unstable with rising temperature and showing signs of fulminant sepsis. Background this is a classic description of a case of necrotizing fasciitis, a bacterial infection of the soft tissues that might be difficult to diagnose in its early stage. It is characterized by rapid progression to local tissue necrosis and severe systemic toxicity, often leading to multiorgan failure and death. Necrotizing fasciitis may be related to surgery or interventional procedures, and the risk is increased in immunocompromised patients. Fortunately, necrotizing fasciitis is uncommon, but the mortality rate is high at approximately 20­40%. Immediate surgical debridement remains one of the key factors for improved survival. Management Diagnosis the diagnosis is foremost clinical, and is guided by the quick progression of the disease. Cyanosis or bronze discoloration of the skin especially near the injury site can be seen, and the subcutaneous tissue may feel indurated or wooden on palpation. The most important symptom is pain, out of proportion to the physical findings or what would commonly be expected as postoperative pain. Anesthesia of the affected area, due to ischemia of the cutaneous nerves, may be a late sign. Systemically the patient may show signs of sepsis, shock, and acute renal failure. Medical photography will be a useful adjunct to the essential detailed description of the findings in the clinical notes. In cases of suspected necrotizing fasciitis, urgent referral to the plastic surgery department is recommended. Plastic surgeons are familiar with the treatment of necrotizing fasciitis and, if uncertainty remains, might initiate or recommend a diagnostic incision [3]. This diagnostic procedure involves an approximately 2-cm incision down to deep fascia in the affected area, performed with an aseptic technique under local anesthesia. In necrotizing fasciitis, an absence of bleeding in subcutaneous tissue may be seen as a result of thrombosis of the subcutaneous vessels and, occasionally, there is a dishwater-colored fluid discharge. Digital examination will often show that subcutaneous tissues can be easily lifted off the fascia by a simple sweep of the finger. The diagnostic incision will also allow deep tissue to be obtained; these should be sent for microbiology testing including immediate Gram stain and culture, as well as histology. It is advisable to contact the duty microbiologist in advance in order to provide information Gynecologic and Obstetric Surgery: Challenges and Management Options, First Edition. Tissue samples of the fascia are to be preferred over skin samples as the latter might be cross-contaminated. Microbiology results may show anaerobic or aerobic bacteria or, commonly, a polymicrobial infection (4). Ultrasound-guided aspiration and Gram staining can also be undertaken but a diagnostic incision is simple and can often provide an immediate and obvious clinical diagnosis. Imaging has been described as a diagnostic tool in necrotizing fasciitis and might be used in the reasonably stable patient, though surgery should never be delayed for further diagnostic tests if necrotizing fasciitis is suspected. Clinical management the key to controlling disease progression in necrotizing fasciitis is early aggressive debridement, supported by appropriate resuscitation and antibiotic therapy. The care of the critically ill patient should follow normal assessment and resuscitation guidelines with respect to fluid management and cardiovascular support. Reassess the patient at short intervals and closely monitor hemodynamic variables. Initiate all routine investigations for the acutely unwell and septic patient including blood gases and cultures. Contact needs to made with the local or regional plastic surgery unit; however, if no plastic surgery services are available in the hospital, transfer of the patient will most likely be too timeconsuming and emergency debridement should not be delayed to allow a transfer. Anticipate that the infection may have spread beyond anatomic boundaries into other areas. Should there be any suspicion preoperatively, liaise with colleagues from other surgical specialties to be available to support the debridement. Surgical management the patient should be taken to the operating room as a true lifethreatening emergency. Position and drape the patient so that access is allowed well beyond the obvious superficial extent of the necrosis as the disease will most likely have progressed further in the deeper fascial layers. It might be advisable to carry out a sharp debridement with a blade rather than diathermy to allow assessment: if the skin edges show healthy capillary bleeding, this is a sign that the vasculitis and thrombosis of the subcutaneous vessels have not progressed this far. Necrotic subcutaneous fat will be seen to have lost its healthy yellow color and consistency. Areas of fascial necrosis will show a yellow-greenish discoloration and your finger will pass with little resistance, dividing the subcutaneous tissue from the fascia. The extent of the fascial necrosis may extend far beyond the superficial demarcation. Remove any tissue that can be easily lifted off the fascia with gentle pressure [4]. Myonecrosis of the underlying muscle is often only present at a later stage of the disease process or associated with compartment syndrome, but if it has occurred then dead muscle should be removed. The muscle will have lost its pink shine and will not show signs of arterial bleeding but, equally importantly, it will cease to contract on stimulation. Pinching with forceps should evoke a twitching of the muscle fibers, but remember to check with the anesthetist that the patient is not relaxed. Excision of the affected tissue in necrotizing fasciitis will necessitate structures to be sacrificed that the surgeon would normally strive to preserve. Tissue samples of the deeper necrosis, preferentially the fascia, should be sent for microbiology and histopathology. Once all necrotic tissue has been excised, the wound cavity should be thoroughly irrigated. Chapter 50: Necrotizing Fasciitis 155 the wound should include steps to achieve meticulous hemostasis, as clotting may be deranged or the blood pressure may be lower than usual because of the systemic effects of the disease. Necrotizing fasciitis commonly requires more than one debridement and the patient should be taken back to theater after a maximum of 24­48 hours or sooner if she is clinically unstable or shows failure to improve.

Amniocentesis is usually done around the 14th week of development blood pressure value ranges cheap 4 mg aceon with mastercard, when ample amniotic fluid is available for sampling without injury to the fetus heart attack 64 chords order discount aceon online. In chorionic villi sampling blood pressure under 80 effective 2 mg aceon, a narrow tube is inserted through the cervix and fetal tissue from chorionic villi is suctioned out arrhythmia nos purchase 2 mg aceon with amex. Both amniocentesis and chorionic villi sampling have inherent risks for mother and fetus blood pressure categories chart proven aceon 4 mg. Fetal cells can also be collected for analysis through a procedure called fetal cell sorting. A fluorescent cell sorter can be used to identify and separate out the rare fetal cells from a maternal blood sample for analysis. This method of fetal cell collection circumvents the health risks associated with amniocentesis and chorionic villi sampling. Though these conventional methods are still more commonly used, fetal cell sorting is being used for purposes of sex determination and determination of fetal Rh status, in addition to the detection of major chromosomal abnormalities and some single-gene disorders. On about the seventh day of development, the blastocyst becomes implanted in the endometrium. Fertilization occurs with the fusion of the sperm nucleus and ovum nucleus, forming a zygote. The amnion develops posterior to the embryo, envelops the embryo, and becomes filled with amniotic fluid that serves as a shock absorber. Both of these extraembryonic membranes form the early formed elements for the embryo. The placenta is formed of both embryonic and maternal tissues and is functional by the end of the eighth week. By the seventh week, the embryo exhibits a head, a body, limbs with digits, eyes, and ears. Embryonic blood is carried to the placenta by umbilical arteries and is returned by an umbilical vein. Cardiovascular adaptations pass oxygenated and nutrient-rich blood as quickly as possible from the umbilical vein to the aorta to meet the needs of body cells. These adaptations include the ductus venosus, foramen ovale, and ductus arteriosus. When the infant starts breathing, fetal cardiovascular adaptations are eliminated to enable an efficient separation of the pulmonary and systemic circuits. Fetal development includes development of the organ systems to functional levels, an increase in size and weight, ossification of bones, and development of distinguishable gender. The corpus luteum produces progesterone and estrogens, which in turn maintain the endometrium. By approximately twelve weeks, the placenta takes over the production of progesterone and estrogens. The corpus luteum degenerates and the ovaries remain inactive for the remainder of the pregnancy. The high blood levels of estrogens in the late stage of pregnancy counteracts the inhibitory action of progesterone against uterine contractions. Pressure of the fetus on the cervix leads to the formation of nerve impulses that are sent to the hypothalamus, which stimulates oxytocin release by the posterior lobe of the pituitary. Oxytocin stimulates uterine contractions, dilating the cervix, which triggers the formation of more nerve impulses. These interactions set up a positive-feedback mechanism that strengthens contractions until birth. There are 46 chromosomes in human body cells: 22 pairs of autosomes and one pair of sex chromosomes. Many genes have only two alleles whose expression is either by dominant/recessive inheritance or by incomplete dominance. Some traits are determined by · · · · · codominance and others are determined by polygenetic inheritance. The probability of transmitting traits to the next generation may be predicted using a Punnett square. Secretion of by the trophoblast and chorion maintains the, which in turn continues to secrete estrogens and. The embryonic disc forms the three that subsequently form all other tissues of the embryo and fetus. The contains fluid in which the embryo develops, and the chorionic villi become the embryonic part of the. At the beginning of the week of development, the developing offspring is called a and it clearly has the features of a human. The first and longest stage of is the dilation of the cervix, which results from uterine contractions stimulated by the hormone. In a fetus, the enables blood to pass from the right atrium into the left atrium, while the passes blood from the pulmonary trunk into the aorta. Lactation begins after from the hypothalamus stimulates secretion of by the anterior lobe of the pituitary gland. The units of inheritance are, which are small segments of that make up chromosomes. Humans possess chromosomes in their cells, and a person possessing two X chromosomes is a. In dominant/recessive inheritance, a recessive allele is expressed only when the person is for the recessive trait. It is possible to predict the of a trait appearing in children if the genotypes of parents are known. Explain why a miscarriage is likely if the placenta is too slow to take over its hormone-producing role. At present, there are no cures or effective treatments for most of the disorders caused by these genes. Anatomy and Physiology Write the terms that match the phrases in the spaces at the right. Lymphoid Muscular Nervous Reproductive, female Reproductive, male Respiratory Skeletal Urinary Chapter 1 Study Guide 423 19) Gas exchange between air and blood. Body Regions Label the body regions by placing the number of the label line in the space by the correct label. Label the body cavities and related structures by placing the number of the label line in the space by the correct label. Place the number of the cavity in which the organ occurs in the space by the organ. Write the names of the membranes that match the statements in the spaces at the right. Abdominopelvic Subdivisions Select the abdominopelvic quadrant and abdominopelvic region in which the following structures are located. Maintenance of Life Write the terms that match the statements in the spaces at the right. Chapter 1 Study Guide 427 5) Sum of the chemical reactions that occur in the body. Label the atom shown by placing the letter of the component in the space by the label, then provide the responses to the phrases below. Why does a diet high in saturated fats increase the risk of coronary heart disease A blood test shows that he has severe hypoglycemia (abnormally low blood glucose) and acidosis. Label the diagram of the cell by placing the numbers of the structures by the labels listed. Diffusion Osmosis Phagocytosis Pinocytosis 1) Passive movement of water across the selectively permeable membrane. Osmosis Pinocytosis Exocytosis Write the missing words in the spaces at the right. Write the summary equation for the cellular respiration of glucose in the blank space provided. Place the numbers (1-5) of the cell parts in the spaces by the correct label and write the names of the mitotic phases (6-9) in the spaces provide. Explain why a chemotherapy drug that disrupts formation of spindle fibers kills cancerous cells. Place the number of each structure (1­6) in the space by the correct label and write the names of the tissues in the spaces provided (7, 8). Place the number of each structure (1­7) in the space by the correct label and write the names of the tissues in the spaces provided (8­10). In each of the spaces provided, write the number of the connective tissue described by the statement. Place the number of each structure (1­3) in the space by the correct label and write the names of the muscle tissues in the spaces provided (4­6). In each of the spaces provided, write the number of the muscle tissue(s) described by the statement. Write the name of the cell in the space below the figure and place the number of each structure in the space by the correct label. Body Membranes In each of the spaces provided, write the number of the membrane identified by the statement. Structure of the Skin and Hypodermis Select the structure described by each statement. Dermis Epidermis Stratum basale Stratum corneum Subcutaneous tissue 1) Contains abundant adipose tissue. The heat that maintains body °C, or temperature is generated as a result of 3 reactions, especially in active organs like the liver and skeletal 4. Overall regulation of body temperature is controlled by the 5, and the 6 plays a key role in conserving and dissipating heat. When body temperature falls below normal, the flow 7 of to the skin is decreased, which decreases heat loss from the skin surface. Shivering increases cellular respiration in skeletal muscles, which generates more 10. When body temperature rises above normal, blood flow to the skin is 11, which increases heat loss from the skin surface. If body temperature becomes extremely high, 12 are activated and begin to secrete 13 onto the surface of the skin. Why is the subcutaneous tissue especially good for rapid absorption of medications Label the diagram by placing the number of each structure by the correct label (some structures might match with more than one number). Bones of the Skeleton 1 2 Write the names of the labeled bones in the spaces provided. Label the diagram of the skull, anterior view, by placing the number of each structure in the space by the correct label. Nasal concha, inferior Nasal concha, middle Parietal bone Squamous suture Sphenoid (2 places) Temporal bone Vomer Zygomatic bone 448 Chapter 6 Study Guide c. Label the diagram of the skull, lateral view, by placing the number of each structure in the space by the correct label. Name the group of bones that provides protection for the 1) Brain 2) Heart and lungs Label the vertebra by placing the number of the structure in the space by the correct label. Its function is to support the upper articulates with the scapula at one end and at the other. Label these diagrams by placing the number of each structure in the space by the correct label. Label the diagrams by placing the number of each structure in the space by the correct label. Indicate whether each of the following is associated with the fibula (F) or tibia (T). Lateral malleolus Lateral condyle Articulates with femur Medial malleolus Medial condyle Articulates with talus 452 Chapter 6 Study Guide 8. Disorders of the Skeletal System Write the name of each disorder described in the space provided. What is this injury, and do you expect it to drastically alter the players ability to play soccer Types of Muscle Tissues Match the types of muscle tissues with the words and phrases. Structure of Skeletal Muscle Write the terms that match the statements in the spaces at the right. The terminal bouton of an activated somatic motor 1) 1 into the 2 where it binds neuron releases 2) 3. The muscle impulse is to receptors on the 3) 4, causing the carried into the muscle fiber by 4) 5. Ca2+ binds with release of Ca2+ from the 5) 6 to shift, troponin in thin myofilaments causing 6) exposing the myosin binding sites on 7 molecules. This process is rapidly repeated until 10) the 10 stops stimulating the muscle fiber. Major Skeletal Muscles Label the muscles and associated structures in the following diagrams by writing the names of the labeled parts in the spaces provided. Disorders of the Muscular System Write the names of the disorders in the spaces provided. A threshold stimulus makes the membrane permeable to 7 ions that rapidly diffuse into the neuron, which depolarizes the membrane forming a nerve 8. When a nerve impulse is formed in a portion of an axon, it triggers a wave of 11 that conducts the nerve impulse along the axon. In neuron-to-neuron synaptic transmission, a nerve impulse reaching a terminal bouton causes the release of a 13 into the 14.

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