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 - Wikipedia, the free encyclopedia Go to the bathroom prior to the reading. A full bladder can change your blood pressure reading.Á« A comprehensive fact sheet - "How to Measure Your Blood Blood Pressure Reading Chart - Blood Pressure Finally, another aspect which should be taken into account, related to blood pressure reading chart is that it is a good thing for the patients to have the High Blood Pressure (Hypertension) - Patient UK A one-off blood pressure reading that is high does not mean that you have 'high blood pressure'. Your blood pressure varies throughout the day. MedlinePlus Medical Encyclopedia: Blood pressure The top number is the systolic blood pressure reading. It represents the maximum pressure exerted when the heart contracts. What Are High Blood Pressure and Prehypertension? It is shown as the top number in a blood pressure reading. High blood pressure is 140 and higher for systolic pressure. Diastolic pressure does not need to What Is High Blood Pressure? A blood pressure reading below 120/80 mmHg is considered normal. In general, lower is better. However, very low blood pressure can sometimes be a cause for Blood Pressure Monitoring at Home -- familydoctor.org Look at the display window to see your blood pressure reading. The machine will show your systolic and diastolic blood pressures on the screen. Blood Pressure Readings - What They Mean A blood pressure reading is shown as two numbers. These numbers measure the pressure against the walls of your blood vessels. The two numbers are usually Blood pressure: A chart explaining your blood pressure reading Blood pressure readings are grouped into four categories. This chart explains the readings. Understanding The Blood Pressure Reading Understanding The Blood Pressure Reading. nokinks.jpg. High Blood Pressure. image: c. kennard. << Previous | Next. Keep in mind that blood pressure and What do the numbers mean in a blood pressure reading? What do the numbers in a blood pressure reading mean and what is a "healthy" blood pressure? Shannon Renton, Washington. Dear Shannon: |
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