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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Low Blood Pressure Within limits, the lower your blood pressure reading is, the better. In most people blood pressure isn't too low until it causes symptoms such as Blood Pressure Guide When BP is low, there is not sufficient flow of blood to deliver enough oxygen and Types Of Blood Pressure Have you checked your blood pressure reading? Low blood pressure - WebMD What Is Low Blood Pressure? Hypotension is the medical term for low blood pressure (less than 90/60). A blood pressure reading appears as two numbers. Blood Pressure (Low) Generally, a Blood Pressure reading of less than 100/60 requires further investigation. Cause Symptoms of Low Blood Pressure include fainting, dizziness, Low blood pressure Low blood pressure - is the pressure reading below 100/70mmHg. Usually sportive or strong persons will have strong heart and stable lower pressure than Blood Pressure, A Doctor's Practical Guide With Insider's Tips 25% of high blood pressure readings are falsely elevated leading to diagnostic Does low blood pressure cause symptoms? Or is it another silent killer? Low Blood Pressure - What is Low Blood Pressure - Is Low Blood In general, if you have no history of medical problems and are not experiencing any symptoms, a low blood pressure reading is not cause for concern. Low blood pressure It is only in a tiny minority of people with low blood pressure, ie, readings below 90/60 mmHg, where there is an underlying cause and treatment may be Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and Learn about low blood pressure (hypotension) is blood pressure below normal. Low blood pressure symptoms may include: lightheadedness, dizziness, Low blood pressure (hypotension) - MayoClinic.com Low blood pressure, also called hypotension, would seem to be something to downward revision of what is considered a normal blood pressure reading. Low blood pressure (hypotension): Causes - MayoClinic.com Higher readings indicate increasingly serious risks of cardiovascular disease. Low blood pressure, on the other hand, is much harder to quantify. |
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