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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Hypertension - Wikipedia, the free encyclopedia Secondary hypertension indicates that the high blood pressure is a result of . Hypertension is one of the most common complex disorders, with genetic WebMD Hypertension/High Blood Pressure Center - Find high blood Find in-depth high blood pressure and hypertension information including its causes, symptoms, Common Treatments for Hypertension/High Blood Pressure What Is High Blood Pressure? High blood pressure is a blood pressure reading of 140/90 mmhg or higher. Common locations are the main artery from the heart (aorta); arteries in the All about high blood pressure High blood pressure is common in Australia. Although it often causes no symptoms High blood pressure (hypertension) is very common and the proportion of Blood pressure (high) Introduction - Health encyclopaedia - NHS Direct High blood pressure is common. Moderately high diastolic pressures (90-109 mmHg) are found in about 1 in 4 middle-aged people. They are less common in Heartpoint: High Blood Pressure Information High blood pressure is far more common in families where other members have Since high blood pressure is so common however, doctors think about it way High Blood Pressure: Things You Can Do to Help Lower Yours Information about lowering your blood pressure from the American Academy of Family Physicians. What Is High Blood Pressure? High blood pressure can occur in children or adults, but it's more common among people over age 35. It's particularly prevalent in African Americans, High Blood Pressure (Hypertension) - Symptoms, Causes, Diagnosis High blood pressure has become the second most common reason for medical office visits in the United States. Blood pressure is measured with a blood High Blood Pressure (Hypertension) - Patient UK In the UK, about half of people over 65, and about 1 in 4 middle aged adults, have high blood pressure. It is less common in younger adults. Common Misconceptions Common misconceptions about high blood pressure. Common symptoms of high blood pressure include nervousness, sweating and difficulty sleeping. |
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