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 - What is MAP ? - Heart Disease - MedHelp Exercise can lower blood pressure) raise the pulseNeck pulse . And then explain what it means. and what the results should be for a healthy Translating Blood Pressure Numbers About 90 percent of all people with high blood pressure have "essential" hypertension - meaning that it has no identifiable cause. Go Ask Alice!: Managing high blood pressure through diet The number 90 is the diastolic pressure, meaning the blood pressure while the heart is relaxing or between beats. People who are genetically sensitive to Uncontrolled High Blood Pressure Means More Cognitive Problems In UNCONTROLLED HIGH BLOOD PRESSURE MEANS MORE COGNITIVE PROBLEMS IN OLD AGE. Study underscores another key reason to control hypertension Howstuffworks "How does a blood pressure gauge (sphygmomanometer A blood pressure gauge is simply a way to measure the performance of the your blood pressure goes up, and it means that your heart has to work too hard. High blood pressure (hypertension) - causes, treatments and High blood pressure (hbp) or hypertension means high pressure (tension) in the arteries. Arteries are vessels that carry blood from the pumping heart to all Blood pressure - Wikipedia, the free encyclopedia The American Heart Association website 7 states, "You may have what's called 'white coat hypertension'; that means your blood pressure goes up when you're Low blood pressure The higher your blood pressure, the higher your risk of heart disease and stroke, whatever your level is. This means that someone with a blood pressure of Measuring Blood Pressure, what the numbers mean. What do the numbers mean? When you have your blood pressure measured, it is written down as two numbers, one over the other like a fraction. For example: High Blood Pressure - What it means and what you can do about it A description of high blood pressure, risk factors of high blood pressure and treatment for controlling hypertension. Blood pressure: A chart explaining your blood pressure reading Blood pressure readings are grouped into four categories. Here's a look at the four blood pressure categories and what they mean for you. |
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