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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Control of Arterial Blood Pressure This fluid movement is controlled by the capillary blood pressure, the interstitial fluid pressure and the colloid osmotic pressure of the plasma. CAPILLARY BLOOD PRESSURE IN MAN. DIRECT MEASUREMENTS IN THE DIGITS CAPILLARY BLOOD PRESSURE IN MAN. COMPARISON OF DIRECT AND INDIRECT PubMed; Eichna, Ludwig W.; Wilkins, Robert W. CAPILLARY BLOOD PRESSURE IN MAN. IngentaConnect The Feasibility and Reliability of Capillary Blood Capillary blood pressure is an essential parameter in the study of the (patho-)physiology of microvascular perfusion. Currently, capillary pressure Journal of Investigative Dermatology - Abstract of article We have devised a system for analyzing the temporal coherence of capillary pressure (CP) and capillary red blood cell velocity (CBV) variations in humans. Capillary blood pressure in syngeneic rat islets transplanted The aim of the present study was to measure capillary blood pressure and interstitial pressure in transplanted pancreatic islets and to correlate these The Feasibility and Reliability of Capillary Blood Pressure as the pipette enters the capillary, the higher capillary pressure urges blood to enter the pipette. This results in an inward displacement of the Direct measurement of capillary blood pressure in the human lip Direct measurement of capillary blood pressure in the human lip. SE Parazynski, BJ Tucker, M Aratow, A Crenshaw, AR Hargens J. Appl. Physiol. Capillary sample There are some disadvantages to capillary blood sampling. Answer questions, check high blood pressure symptoms, find resources The Human Circulatory System II Near the venous end of a capillary, the blood pressure is greatly reduced (to about 15 torr). Here another force comes into play. Blood Vessels Each blood vessel has it's own blood pressure value, arterial blood pressure, capillary blood pressure, venous blood pressure, left atrial blood pressure, Pressure in the Human Circulatory System Maximum (systole) Minimum (diastole), 13-18 8-12, 100-140 60-90. Venous blood pressure Great veins, 0.4-0.9 <0.1, 3-7 <1. capillary blood pressure |
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