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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IB100 - Circulatory System - Factors affecting Blood Pressure Measuring blood pressure is a common procedure in hospitals and doctor offices. We use blood pressure to determine the activity of our circulatory system Cardiovascular & Circulatory System Health - Promote Normal Blood Natural ways to support cardiovascular & circulatory system health for normal blood pressure levels. On Special! High-Rite. Support healthy blood pressure Circulatory System - MSN Encarta Blood, fluid pumped through the circulatory system · Comparative Anatomy: . Once blood reaches the capillary level, blood pressure is greatly reduced. Human Circulatory System - Blood Pressure A low blood pressure (within reason) may be considered an asset, since less stress is put on the circulatory system. Increased blood pressure usually The Human Circulatory System II All the functions of the circulatory system occur in the capillary beds. The medical term for high blood pressure is hypertension. CIRCULATORY SYSTEMS Changes in blood pressure also occur in the various vessels of the circulatory system, as shown in Figure 6. Nutrients, wastes, and hormones are exchanged Pressure in the Human Circulatory System Pressure plays an important role in our health, as for example blood pressure in the human circulatory system. Blood pressure is the pressure that is Blood pressure - Wikipedia, the free encyclopedia In the circulatory system, this is the resistance of the blood vessels. The higher the resistance, the higher the arterial pressure. Respiratory system - Wikipedia, the free encyclopedia Thus, the respiratory system facilitates oxygenation of the blood with a . the pulmonary blood vessels are normally low as compared to the pressure of Circulatory System Arthropods, like insects and spiders, have an open circulatory system, This is called systole and the systolic blood pressure (BP) is the higher of the Blood pressure: information about, high blood pressure, symptoms Blood pressure is the force created by the heart as it pushes blood into the arteries and the circulatory system. When the heart pumps, it causes blood to |
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