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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Blood pressure - Wikipedia, the free encyclopedia Blood pressure (strictly speaking: vascular pressure) refers to the force exerted by circulating blood on the walls of blood vessels, and constitutes one of What Is High Blood Pressure? High blood pressure is a blood pressure reading of 140/90 mmHg or higher. Your Guide to Lowering High Blood Pressure, NHLBI This site, for people who want to learn about preventing and controlling high blood pressure. Based clinical guidelines and research studies, Blood Pressure Blood pressure results from two forces. One is created by the heart as it pumps blood into the arteries and through the circulatory system. What Is High Blood Pressure? Learn about various levels of blood pressure and how high blood pressure (hypertension) is defined. MedlinePlus Medical Encyclopedia: Blood pressure Blood pressure is a measurement of the force applied to the walls of the arteries as the heart pumps blood through the body. The pressure is determined by blood pressure articles, information and news (NewsTarget) Cocoa reduces high blood pressure but tea does not, according to a study published in the Archives of Internal Medicine. Blood pressure measurement Most people have had their blood pressure taken at some time. It is a simple and painless procedure that gives a lot of useful information about the heart Blood Pressure - Health News - The New York Times A free collection of articles about blood pressure published in The New York Times. High blood pressure (hypertension) - MayoClinic.com High blood pressure â” Comprehensive overview covers symptoms, treatment and prevention of hypertension. Using EFT for High (or low) Blood Pressure EFT's results for blood pressure problems are often astonishing. This is true for both high blood pressure and low blood pressure. |
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