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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Fact sheet--High Blood Pressure (Hypertension) High blood pressure (also called hypertension) is a serious illness that affects nearly 65 million adults in the United States. High blood pressure is often Healthy Hearts: Hypertension/High Blood Pressure - The Human Heart If either or both numbers are equal to or greater than 120 over 80 for an extended period of time, you have high blood pressure, or hypertension. Blood pressure (high) Introduction - Health encyclopaedia - NHS Direct Persistent high blood pressure (hypertension), if untreated puts you at Hypertension (high blood pressure) is defined as a systolic pressure of 140 mmHg High Blood Pressure (Hypertension) - Yahoo! Health Your blood pressure measurement consists of two numbers: systolic and diastolic. Lotrel.com Lotrel.com. 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, High Blood Pressure (Hypertension) Links to information on high blood pressure or hypertension. High blood pressure (hypertension) - MayoClinic.com High blood pressure � Comprehensive overview covers symptoms, treatment and prevention of hypertension. WebMD Hypertension/High Blood Pressure Center - Find high blood High blood pressure affects I in 4 American adults. Find in-depth high blood pressure and hypertension information including its causes, symptoms, High blood pressure (hypertension) The heart is a pump designed to force blood through our body. Blood is pumped from the heart through the arteries out to our muscles and organs. High Blood Pressure (Hypertension) - Patient UK Having high blood pressure is one of several 'risk factors' that can increase your chance of developing heart disease, a stroke, and other serious Hypertension or High Blood Pressure - cardiologychannel Hypertention (HTN), or high blood pressure has a high incidence throughout the world. Over half of all persons age 65 and older develop hypertension. Hypertension - Wikipedia, the free encyclopedia Hypertension, commonly referred to as "high blood pressure" or HTN, is a medical condition in which the blood pressure is chronically elevated. MedlinePlus: High Blood Pressure High Blood Pressure (Hypertension)(Food and Drug Administration); High Blood Pressure . Hypertension (High Blood Pressure)(Nemours Foundation) Hypertension (High Blood Pressure) About one in five Americans has high blood pressure. Of those people with hypertension, about one third to one half don't even know they have it. High Blood Pressure King Pharmaceuticals, Inc., maker of Altace® is a proud sponsor of the AHA Hypertension Web site. Omron is a proud sponsor of the High Blood Pressure Web High Blood Pressure (Hypertension) It might seem odd that kids can have high blood pressure, or hypertension, because we usually associate the condition with older people. What Is High Blood Pressure? High blood pressure (or hypertension) is defined in an adult as a blood pressure greater than or equal to 140 mm Hg systolic pressure or greater than or High blood pressure (hypertension) - causes, treatments and High Blood Pressure: Medical information about hypertension, its treatment, therapies and prevention. |
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