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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Cardiovascular System Gets Lazy In Space The cardiovascular system has two major functions: to supply blood with to monitor blood flow and blood pressure in different regions of the body. Heart-Cardiovascular System, Blood Pressure Supplements Heart & Cardiovascular System & Natural Herbal Nutritional Blood Pressure Supplements. More Information On Circulin For High Blood Pressure. Cardiovascular System / Blood / Physiology of Circulation In common usage, the term blood pressure refers to arterial blood pressure, pressure. Blood pressure is measured with a sphygmomanometer and is recorded The Heart and Cardiovascular System The cardiovascular system is made up of the heart and the blood vessels, such as the veins and Blood pressure, kidney disease: see BP & Kidney Disease Cardiovascular & Circulatory System Health - Promote Normal Blood High-Rite supports the healthy functioning of the cardiovascular system, thereby helping to maintain balanced pressure of the blood on veins and arteries, Cardiovascular System II: Blood Pressure Normal blood pressure in adults is 120 mm Hg/80 mm Hg (systolic/diastolic), when measured at the brachial artery in the arm, the standard point of reference PATTS - Cardiovascular System Blood pressure is measured in mm of mercury, with the systole in ratio to the diastole. The InnerBody: Anatomy Tutorials - Cardiovascular System: Heart The cardiovascular system - health information on how it works BUPA health factsheet - the cardiovascular system consists of the heart, lungs, blood vessels and This is the maximum pressure in your blood system. Blood pressure - Wikipedia, the free encyclopedia This system allows the kidney to compensate for loss in blood volume or drops in arterial pressure by activating an endogenous vasoconstrictor known as Cardiovascular System Information The pressure and flow of the blood arise from the beating heart muscle, which is the pump of the cardiovascular system. To understand how the heart works |
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