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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Le Magazine, May 2005 - Report: Warning! Normal Blood Pressure May Why such confusion about acceptable blood pressure levels? People without high blood pressure will fluctuate into clearly abnormal ranges during periods Acceptable ranges for vital signs during general anesthesia (often unstated) ranges of acceptable values for a given . operating range (COR) limits for systolic blood pressure. The mag- Blood Services - The Greenwich Red Cross The next time they wish to donate, their blood pressure will be taken again and it may be within the Red Cross' acceptable range. Prehypertension Changes â˜Acceptableâ™ Blood Pressure Figures Prehypertension Changes â˜Acceptableâ™ Blood Pressure Figures Once you've got high blood pressure, or prehypertension, a range of treatments are available High Blood Pressure A teenager may have an acceptable blood pressure of 110/70, A range of blood pressure values is given based on how old and how tall your adolescent is. Hypotension - Wikipedia, the free encyclopedia Hypotension is not hypertension, which is high blood pressure, to maintain an acceptable blood pressure over a wide range of activities and in many New High Blood Pressure (Hypertension) Guidelines Millions of people whose blood pressure was considered borderline high or even normal health experts lowered the acceptable normal range to urge more Measuring the Blood Pressure 'Normal' or 'acceptable' blood pressure varies with age, state of health and clinical situation. At birth, a typical blood pressure is 80/50 mmHg. Effects of Normal, Pre-Hypertensive, and Hypertensive Blood Another 157 had blood pressure in the pre-hypertensive range â” 128/76 mmHg heart disease and acceptable blood pressure levels, blood pressure can still High Blood Pressure (Hypertension) - Yahoo! Health Your blood pressure measurement consists of two numbers: systolic and diastolic. health experts lowered the acceptable normal range to promote more |
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