What is Cholesterol?Cholesterol is a sterol (a combination steroid and alcohol). Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in solid form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the compound "cholesterine".[2]Most of the cholesterol is synthesized by the body and some has dietary origin. Cholesterol is more abundant in tissues which either synthesize more or have more abundant densely-packed membranes, for example, the liver, spinal cord and brain. It plays a central role in many biochemical processes, such as the composition of cell membranes and the synthesis of steroid hormones. Cholesterol is insoluble in blood, but is transported in the circulatory system bound to one of the varieties of lipoprotein, spherical particles which have an exterior composed mainly of water-soluble proteins. The main types, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) carry cholesterol from and to the liver.According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As high LDL contributes to this process, it is termed "bad cholesterol", while high levels of HDL ("good cholesterol") offer a degree of protection. The balance can be redressed with exercise, a healthy diet, and sometimes medication. |
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MedlinePlus Medical Encyclopedia: Dizziness Dizziness is lightheadedness, feeling like you might faint, being unsteady, This can happen if there is a sudden drop in your blood pressure or you are Hypertension: high blood pressure, dizziness, trouble breathing Hi Mariam, A stress test is when you are hooked up to EKG wires and walk a treadmill. An ECG and EKG are the same. As for the tumor, that is what a pheo is. Postural hypotension in the elderly - low blood pressure and Postural hypotension in the elderly - low blood pressure and dizziness may lead to falling and broken bones from Nutrition Health Review in Health provided Dizziness Because medical conditions such as high blood pressure or low blood sugar can affect blood flow, these conditions are frequently accompanied by dizziness. Orthostatic Hypotension Orthostasis means upright posture, and hypotension means low blood pressure. Thus, orthostatic hypotension consists of symptoms of dizziness, faintness or Dizziness People who are prone to dizziness because they take medications for heart conditions or high blood pressure should avoid sudden changes of position. BBC - Health - Conditions - Dizziness Many attacks of dizziness are caused by momentary, harmless drops in blood pressure, leading to a transient reduction in the blood supply to the brain. High blood pressure and dizziness - Heart Disease - MedHelp This is a discussion on MedHelp about High blood pressure and dizziness. Community members of MedHelp provide help, support, guidance and discussion around Natural Remedies for High Blood Pressure High blood pressure usually doesn't cause any symptoms in the early stages. Symptoms associated with high blood pressure can include:. Dizziness or dizzy Information on vestibular balance disorders (causing dizziness Patients often describe balance problems in terms of vertigo, dizziness, For instance, orthostatic hypotension is low blood pressure that occurs upon Low blood pressure Therefore, if you have a low blood pressure and you also have symptoms of dizziness or faintness when standing up suddenly you should have your blood |
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