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 results Blood pressure chart showing high Systolic or low Diastolic readings, helping you establish if you have high, low or normalblood pressure. Lower Blood Pressure | Hypertension | High Blood Pressure Diet Blood pressure is the pressure of the blood against the walls of the arteries. Blood pressure results from two forces. The heart creates one force as it Blood Pressure - High - Low - Information As the blood circulates around the body, it is under pressure. The blood pressure is a result of the pumping action of the heart and the resistance of the A-Z Health Topics >> Blood Pressure Blood pressure can be measured by your general practitioner. Your blood pressure result will have two numbers (eg 120/90). The first (higher) number is the Health concerns: understanding your blood pressure results This article will help you to interpret your blood pressure results, and explain the numbers given in the measurement and where they come from. 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. About High Blood Pressure When the heart beats, it pumps blood to the arteries and creates pressure in them. This pressure (blood pressure) results from two forces. HIGH BLOOD PRESSURE (HYPERTENSION) In some people, high blood pressure is the result of another medical problem or medicine. When the cause is known, this is called secondary high blood High Blood Pressure Results Anyone with a blood pressure measured at 140/90 or higher on at least two occasions has high blood pressure and will generally require drug treatment to Blood pressure - Wikipedia, the free encyclopedia If the blood gets thicker, the result is an increase in arterial pressure. Certain medical conditions can change the viscosity of the blood. |
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