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 normal? Maybe now it isnâ™t. What was classified as normal or high-normal blood pressure (a systolic pressure of What's more, if you get your systolic pressure into a healthy range, High blood pressure (hypertension) A typical normal blood pressure reading would be 120/80 mmHg. What's classed as high? There is a natural tendency for blood pressure to rise with age due to Stress and high blood pressure: What's the connection But once the stressor disappears, your blood pressure returns to normal. Stressful situations: What's your current reaction? Blood pressure - what's yours at? - Seniors' Health - AOL Health Blood pressure - what's yours at? Although we've been measuring blood As well, a "normal" blood pressure has long been held to be anything below 140/90, Blood Pressure: What's normal? Q. Some 25 years ago, when I was Professor of Rehabilitation Medicine, normal blood pressure was considered to be a range of values. Blood Pressure Explained Normal blood pressure is less than 120/80 High normal blood pressure is between It is normal for blood pressure readings to vary throughout the day Hypertension (High Blood Pressure) Doctors recommend that older teens with normal blood pressure get their blood Some people have what's called "white coat hypertension," meaning that MedlinePlus: High Blood Pressure 120/80 or lower is normal blood pressure; 140/90 or higher is high blood pressure . Stress and High Blood Pressure: What's the Connection? Blood Pressure: What's Optimal? What's Not? What is "normal" blood pressure (BP)? Is it different from optimal BP? Blood Pressure: What's Optimal? What's Not? DONALD G. VIDT, MD-Series Editor Kidney disease articles What's your blood pressure? In 1984 the United States Congress declared May to keep your blood pressure within normal limits and protect your kidneys. Stress and high blood pressure: What's the connection? - CNN.com Stress and high blood pressure: What's the connection? But once the stressor disappears, your blood pressure returns to normal. |
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