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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high blood pressure in head? - Neurology - MedHelp Blood in semen pressurePressure ulcer is typically 130/80not high enough to cause such dramatic symptoms so I ask, can there be something that causes Blood Pressure Elevated and Pulsing in head and back - Heart This is a discussion on MedHelp about Blood Pressure Elevated and Pulsing in head and back. Community members of MedHelp provide help, support, guidance and clinical & research news Head Injury, Blood Pressure May Predict Alzheimer's Risk. Mental agility and taking Vitamin E, among other factors, may help folks avoid Alzheimer's disease CiNii - Initial Drop of Blood Pressure during Head-up Tilt in Blood pressure (BP) was determined by the auscultatory method. SV, HR, CO and BP were measured every 2 min before and during 7 min of 60-degree head-up tilt Differences in overshoot of blood pressure after head-up tilt in PAF pure autonomic failure; MSA multiple system atrophy; SBP systolic blood pres-. sure; DBP diastolic blood pressure; HR heart rate; HUT head-up tilt; blood pressure in head >> Medical Questions, Weight Loss I would like to ask you about my medical problem that I have been experiencing for some time now. I have constant headaches, but not those usual ones. Blood pressure in head injured patients -- Mitchell et al Objectives: To determine the statistical characteristics of blood pressure readings from a large number of head injured patients. Blood pressure in head-injured patients -- Mitchell et al. 78 (4 Conclusions: Patients with head injury appear to have a near normal distribution of blood pressure readings that are skewed towards higher values. Intracranial pressure - Wikipedia, the free encyclopedia Another way to lower ICP is to raise the head of the bed, allowing for venous drainage. A side effect of this is that it could lower pressure of blood to High Blood Pressure Head injury may raise the pressure inside the brain, which affects the body's ability to regulate blood pressure normally. |
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