AIDS is caused by infection with HIV. It is a virus that causes impairment or deficiency of the immune system. The virus is small, fragile and of relatively simple construction. The virus binds to cells that have a particular surface antigen called CD monocytes and macrophages. Once bound, the viral RNA enters the cell and using the cells components makes a DNA copy of itself by reverse transcription. The newly formed DNA then inserts itself into the host DNA. It may cause cell death immediately or lie dormant until the cell is activated by some other infection.

A basic knowledge of the physiology of the heart, the mechanism of contraction, electrical activity and control of rate and rhythm, maintenance of blood pressure and what can go wrong is needed in order to understand how the drugs work. The heart consists of four chambers: two atria and two ventricles and is divided into right and left sides. The walls of the atria and ventricles consist of cardiac muscle, with that of the left ventricle being the thickest. Collectively cardiac muscle is known as the myocardium. The heart functions as a double pump to circulate blood through the lungs and round the rest of the body. The circuit of blood through the heart is as follows. Blood enters the right atrium from the superior and inferior vena cavae. The atrium contracts and from here the blood passes through the tricuspid valve to the right ventricle. The ventricle contracts and blood flows through the pulmonary valve and pulmonary arteries to the lungs.

At the same time they increase fluid secretion from the intestinal mucosa. Stimulant laxatives can cause abdominal cramps. Stimulant laxatives are unsuitable for prolonged use because this can lead to excessive loss of potassium ions and a colon that no longer responds to stimulation. They are, however, useful for emptying the bowel before surgery and radiological imaging. They have an effect within used in this way are bisacodyl and sodium picosulfate.

In addition to this, many older patients use self-medication with non-prescribed remedies. It has been estimated that on average, for each prescription item older people receive, they use two additional non-prescription items. This increased drug usage in the elderly can give rise to a number of problems. Drugdrug interaction This occurs when two or more drugs, being taken concurrently, produce a pharmacological response not attributable to a single drug. The practice of multiple drug prescribing is known as polypharmacy.

Pathological features of Alzheimers disease are extracellular plaques of β-amyloid protein and neurofibrillary tangles. β-amyloid plaques are found particularly in the hippocampus and association areas of the cerebral cortex. Similar plaques are seen in unaffected individuals, but there are many more in patients with Alzheimers disease. Their formation may be due to abnormal metabolism of a precursor protein. Neurofibrillary tangles are found in neurons and may be collections of abnormal microtubule proteins, which form as a result of cell destruction.

This technique is similar to spinal anaesthesia. It is technically more difficult but is considered to be safer and has largely replaced spinal anaesthesia. The local anaesthetic is introduced into the extradural space between the bone of the spine and the dura mater, which is filled with fatty tissue and blood aldara cost uk. The drug then diffuses into nervous tissue. This method is used for the complete anaesthesia of a single limb, usually the arm.

This makes drug treatment difficult because drugs effective against one stage in the life cycle are ineffective at other stages. Resistance to antimalarial drugs is now common. The most severe form of malaria is caused by Plasmodium falciparum and can be fatal. Fever occurs every third day due to rupture of infected red blood cells. Other forms are less severe and rarely fatal.

The adrenal cortex secretes aldosterone, cortisol and testosterone from different layers. Aldosterone causes salt and water reabsorption in the kidney if blood pressure or blood volume is low. Cortisol has a complex role in the body, being able to increase circulating glucose levels and mobilize amino acids and fatty acids in response to stress and trauma. Cortisol derived drugs are used therapeutically for their anti-inflammatory and immunosuppressant actions. There are several disorders of the adrenal glands.

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