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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Extreme Drop in Blood Pressure - Allergy - MedHelp Blood in semen pressurePressure ulcer had dropped and I was almost unconcious, going in and out. Did numerous tests. I remember being on the table knowing I Heart Health - Pressure Drop: Treating Orthostatic Hypotension But low blood pressure can also wreak havoc on one's health and ability to function. Pressure Drop: Treating Orthostatic Hypotension Blood pressure dropped when pill taken at night: study Taking a blood pressure pill at bedtime instead of in the morning might be healthier for some high-risk people. Her Blood Pressure Dropped to Zero My niece Judy, who's an RN, held my hand during this period and watched as my blood pressure dropped down to practically zero. Blood pressure - Wikipedia, the free encyclopedia For instance, with a subject in the supine position, blood travelling from the heart to the toes typically only experiences a 5 mmHg drop in mean pressure. Your High Blood Pressure Questions Answered â” Low Blood Pressure Blood loss. A significant loss of blood from major trauma or severe internal bleeding reduces blood volume, leading to a severe drop in blood pressure. Hypotension - Wikipedia, the free encyclopedia Neurocardiogenic syncope is a form of dysautonomia characterized by an inappropriate drop in blood pressure while in the upright position. Orthostatic hypotension (postural hypotension) - MayoClinic.com Orthostatic hypotension â” also called postural hypotension â” is a form of low blood pressure that happens when you stand up from sitting or lying down. Low blood pressure - WebMD This offsets the drop in blood pressure. If this does not happen, or happens too slowly, postural hypotension results. The risk of both low and high blood Low blood pressure (hypotension): Causes - MayoClinic.com On the other hand, a sudden fall in blood pressure can be dangerous. A change of just 20 mm Hg â” a drop from 130 systolic to 110 systolic, for example â” can Low blood pressure This drop in blood pressure when you stand up is called postural hypotension. If you are well with no drop in blood pressure when standing then you |
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