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 vessel -- Britannica Online Encyclopedia condition in which the blood pressure is abnormally low, either because of reduced blood volume or because of increased blood-vessel capacity. Vessel, Pressure, and Flow Questions The blood vessels that play the most important role in the regulation of blood flow to a tissue and blood pressure are the: Bad metabolism in blood vessels linked to high blood pressure An experiment that turned out very differently than expected led scientists at the School of Medicine to the first direct link between inefficient Novel Long-Term Implantable Blood Pressure Monitoring System vessel for real time blood pressure monitoring, as shown in. Figure 1. . cuff and blood vessel pressure as a function of time, re-. spectively. Researchers Learn How Blood Vessel Cells Cope With Their Pressure Rubber bands form stress wrinkles parallel to the direction in which they are being pulled. However, healthy bovine aorta endothelial cells stretched in a Aging of your Heart and Blood Vessels is Risky Over time elevated pressure causes damage to blood vessels and to the organs the vessels supply with blood, called target organs. This vascular damage can Researchers learn how blood vessel cells cope with their pressure UCSD scientists have gained a better understanding of how repetitive stretching of endothelial cells that line arteries can make them healthy and resistant News_7-8-2007-14-8-13 High blood pressure increases the chance of both a blood vessel leaking or rupturing, and of a clot forming within a blood vessel. High blood pressure Blood Vessels do they NOT follow Bernoulli's principle? We didn't say not to mix Bernoulli with blood vessel pressure. What we're saying is that you are just applying it incorrectly. So let me try again: High Blood Pressure and Stroke The Influence of High Blood Pressure:. High blood pressure can. Speed up buildup in arteries, narrowing blood vessels that supply the brain Researchers Learn How Blood Vessel Cells Cope with their Pressure The 60-cycle-per-minute motion of the indenter simulated the stretching movements of a blood vessel in response to the rising-and-falling blood pressure High blood pressure dangers: Hypertension's effects on the body High blood pressure can injure both the blood vessels in and leading to your Eye blood vessel damage (retinopathy). High blood pressure can damage the Blood pressure: information about, high blood pressure, symptoms If high blood pressure is left unchecked, it can cause blood vessels in the kidneys to become thickened and narrowed, possibly leading to reduced blood Prevent diabetes problems: Keep your heart and blood vessels healthy The smaller opening makes the water shoot out with more pressure. In the same way, narrowed blood vessels lead to high blood pressure. High Blood Pressure: Heart and Blood Vessel Disorders: Merck For example, an increase in the amount of blood pumped out by the heartâ”which tends to increase blood pressureâ”causes dilation of blood vessels and an Blood vessel - Wikipedia, the free encyclopedia The blood pressure in blood vessels is traditionally expressed in millimetres of mercury (1 mmHg = 133 Pa). In the arterial system, this is usually around Blood Vessels - The Human Heart: An Online Exploration from The Besides circulating blood, the blood vessels provide two important means of measuring vital health statistics: pulse and blood pressure. |
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