Jeffrey Sellers, MD
- Department of Obstetrics and Gynecology
- Abington Memorial Hospital
Histologic classification of veins is less satisfactory than for arteries gastritis diet treatment medications generic omeprazole 40 mg visa, but several subdivisions usually are made namely gastritis nsaids purchase 20 mg omeprazole otc, venules and small gastritis diet safe 10mg omeprazole, medium gastritis main symptoms order omeprazole 10mg otc, and large veins. The junctions between venules and capillaries are important sites of fluid exchange between tissues and blood. The tunica intima consists of a thin, continuous endothelium, the cells of which are loosely joined by poorly developed intercellular junctions. The thin basal lamina is pierced by pericytes that appear to make contact with the endothelial cells. The tunica media is missing in the smallest venules, and the relatively thin adventitia contains a few collagen fibers, scattered fibroblasts, mast cells, macrophages, and plasma cells. The adventitia increases in thickness and consists of longitudinally arranged collagen fibers that form an open spiral around the vessel. The tunica intima consists only of a continuous endothelium that rests on a thin basal lamina. Smooth muscle cells make up a tunica media, which contains one to four layers of cells. The tunica adventitia forms a relatively thick coat and contains longitudinally oriented collagen fibers and some thin elastic fibers. It consists of a loosely knit connective tissue with thick, longitudinal bundles of collagen and elastic fibers. Smooth muscle bundles, also longitudinal in orientation, are present and are especially well developed in the inferior vena cava. A thin tunica media is poorly developed and may even be absent; otherwise it has the same organization as that in medium veins. The tunica intima is supported by a subendothelial layer that may become prominent in larger trunks. The thin tunica intima consists of endothelial cells resting on a basal lamina, but a narrow subendothelial layer may be present and contains fine collagen fibers and scattered thin elastic fibers. The elastic fibers may form a network at the junction of tunica intima and media, but a poorly defined internal elastic lamina is formed only in the larger vessels. In most medium veins, the tunica media, though well developed, is thinner than in corresponding arteries. The thick tunica adventitia forms the bulk of the wall and is larger than the tunica media. It consists of collagen and elastic fibers and frequently contains longitudinally oriented smooth muscle cells. Most medium veins are equipped with valves, two pocket-like flaps of tunica intima that project into the lumen, their free edges oriented in the direction of flow. A rich network of elastic fibers is present in the connective tissue beneath the endothelium on the down-stream side of the valves. As blood flows toward the heart, the valves are forced against the vessel wall, but with back-flow, the valves are forced outward against each other to occlude the vessel and prevent reversal of blood flow. Veins with Special Features Some veins lack a tunica media, such as the trabecular veins of the spleen; veins of the retina, bone, and maternal placenta: most meningeal and cerebral veins; and those of the nail bed. Veins in the pregnant uterus contain smooth muscle in all three coats; in the intima the fibers run longitudinally rather than circularly, as they do also in the tunica intima of the saphenous, popliteal, femoral, umbilical, and internal jugular veins. At their junctions with the heart, the adventitia of the pulmonary veins and venae cavae are provided with a coat of cardiac muscle; the fibers run longitudinally and circularly about the vessels for a short distance. Arteriovenous Anastomoses In addition to their capillary connections, arteries and veins may unite by shunts called arteriovenous anastomoses. Generally these arise from side branches of arterioles that pass directly to venules. They are thick-walled, muscular vessels of small caliber that usually are coiled and surrounded by a connective tissue sheath.
An average of 42 minutes of sleep debt occur for those with chronic pain gastritis kefir omeprazole 10mg cheap, and 14 minutes for those who have suffered from acute pain in the past week chronic gastritis definition 40 mg omeprazole otc. Stress and overall poor health are also key components of shorter sleep durations and worse sleep quality gastritis diet 8 hour omeprazole 20mg fast delivery. Those in midlife with lower life satisfaction experienced greater delay in the onset of sleep than those with higher life satisfaction congestive gastritis definition discount omeprazole 20mg free shipping. Delayed onset of sleep could be the result of worry and anxiety during midlife, and improvements in those areas should improve sleep. Sleep deprivation suppresses immune responses that fight off infection, and can lead to obesity, memory impairment, and hypertension (Ferrie et al. Insufficient sleep is linked to an increased risk for colon cancer, breast cancer, heart disease and type 2 diabetes (Pattison, 2015). A lack of sleep can increase stress as cortisol (a stress hormone) remains elevated Source which keeps the body in a state of alertness and hyperarousal which increases blood pressure. During deep sleep a growth hormone is released which stimulates protein synthesis, breaks down fat that supplies energy, and stimulates cell division. Results indicated that irregular sleep schedules, including highly variable bedtimes and staying up much later than usual, are associated in midlife women with insulin resistance, which is an important indicator of metabolic health, including diabetes risk. By disrupting circadian timing, bedtime variability may impair glucose metabolism and energy homeostasis. Exercise, Nutrition, and Weight the impact of exercise: Exercise is a powerful way to combat the changes we associate with aging. Exercise builds muscle, increases metabolism, helps control blood sugar, increases bone density, and relieves stress. Unfortunately, fewer than half of midlife adults exercise and only about 20 percent exercise frequently and strenuously enough to achieve health benefits. Many stop exercising soon after they begin an exercise program, particularly those who are very overweight. The best exercise programs are those that are engaged in regularly, regardless of the activity. A well-rounded program that is easy to follow includes walking and weight training. Having a safe, enjoyable place to walk can make the difference in whether or not someone walks regularly. Weight lifting and stretching exercises at home can also be part of an effective program. Walking, jogging, cycling, or swimming can release the tension caused by stressors. Promoting exercise for the 78 million "baby boomers" may be one of the best ways to reduce health care costs and improve quality of life (Shure & Cahan, 1998). Aerobic activity should occur for at least 10 minutes and preferably spread throughout the week. Adults should also participate in muscle-strengthening activities that are moderate or high intensity and involve all major muscle groups on two or more days per week. However, eating less does not typically mean eating right and people often suffer vitamin and mineral deficiencies as a result. All adults need to be especially cognizant of the amount of sodium, sugar, and fat they are ingesting. The American Heart Association (2016) reports that the average sodium intake among Americans is 3440mg per day. High sodium levels in the diet is correlated with increased blood pressure, and its reduction does show corresponding drops in blood pressure. Adults with high blood pressure are strongly encouraged to reduce their sodium intake to 1500mg (U. Excess Fat: Dietary guidelines also suggests that adults should consume less than 10 percent of calories per day from saturated fats. The American Heart Association (2016) says optimally we should aim for a dietary pattern that achieves 5% to 6% of calories from saturated fat. Diets high in fat not only contribute to weight gain, but have been linked to heart disease, stroke, and high cholesterol. Excess sugar not only contributes to weight gain, but diabetes and other health problems.
Thus gastritis causes and symptoms discount 20mg omeprazole amex, weeping lubrication also could serve as a method for pumping nutrients and wastes into and out of the cartilage gastritis extreme pain omeprazole 20mg with mastercard. A mechanism of "boosted lubrication" takes into account the irregularities normally seen on the surface of articular cartilage gastritis diet 7 hari discount omeprazole 40mg amex. As the cartilage is compressed chronic gastritis management cheap omeprazole 20 mg on-line, pools of synovial fluid are trapped in the furrows and valleys of the articular surfaces. As compression increases, a mobile component of the fluid containing small molecules is forced into the cartilage at the areas of pressure. The fluid in the valleys thus becomes increasingly rich in hyaluronidate and more viscous so that as the pressure increases, the synovial fluid progressively becomes more effective as a lubricant. Unlike other connective tissues, however, the intercellular substance of blood lacks a fibrous component, and most of the intercellular protein is produced by cells in other tissues (chiefly the liver) and not by the blood cells. Many of the formed elements of blood consist of anucleate elements (erythrocytes) and bits of cytoplasm (platelets). True cells - leukocytes make up only a small part of the formed elements and are present only as transients that use the blood for transportation to other organs and tissues into which they migrate to carry out their functions. None of the formed elements normally replicate within the blood; as they are lost, new elements are added from special bloodforming tissues outside the circulation. Thus, blood can be considered the secretory product of several organs and tissues rather than a tissue per se. The globulins (alpha, beta, and gamma) include several proteins of different sizes. The gamma globulins are immunoglobulins (antibodies) synthesized by cells of the lymphatic organs and tissues. The plasma also contains hormones from various endocrine organs, metabolites, nutrients and several other substances. A partial list of normal values of other substances found in human blood is provided in Table 5-1. Plasma is obtained from blood after treatment with an anticoagulant and contains all the components of the fluid portion of blood. In contrast, serum is obtained from clotted or defibrinated blood and does not contain fibrinogen; it does contain other components elaborated during the process of blood clotting. These elements can be separated by centrifugation, and when done in calibrated tubes, the result (hematocrit) gives an estimate of the volume of the formed elements. The heaviest components, erythrocytes, form the lower layer and make up about 45% of the blood volume. Platelets and leukocytes are present in the buffy coat, a grayish white layer immediately above the erythrocytes, and form about 1% of the total blood volume. The uppermost layer consists of plasma, a proteinaceous solution, which contains three main types of protein: albumin, globulin, and fibrinogen. Albumin, the most abundant and smallest of the plasma proteins maintains blood 67 Erythrocytes At rest, the average human uses about 250 ml of oxygen and produces almost 200 ml of carbon dioxide per minute. Oxygen and carbon dioxide are carried by the erythrocytes, which transport the gases with great efficiency. Exchange of gases occurs in the blood capillaries of the lung, through which the erythrocytes pass in less than 1 second, yet gaseous exchange is complete in approximately the first third of this time. Face on, the normal erythrocyte presents a smooth, rounded contour with a central depression. Apparently this thickness allows hemoglobin to maintain a distance from the cell surface that is optimal for its function. Erythrocytes are enclosed in a typical cell membrane, whose flexibility and elasticity allow the red cell to accommodate its passage through the small capillaries. In vivo, the red cells often assume a cup shape as they pass through small blood vessels. A subplasmalemmal network of protein (spectrin) helps to maintain the biconcave shape and still allows flexibility. Spectrin, linked by actin, appears to form a web immediately beneath the plasmalemma and may act as a cytoskeleton.
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