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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Blood Pressure (Low) Low Blood Pressure is not a disease in itself, but is a symptom of an underlying problem. Always consult your Doctor, as many conditions may have similar Blood pressure - Wikipedia, the free encyclopedia Repositioning the body perpendicular to gravity largely eliminates the problem. Other causes of low arterial pressure include:. Sepsis · Hemorrhage - blood MedlinePlus: Low Blood Pressure Some people may experience symptoms of low pressure when standing up too quickly. Low blood pressure is a problem only if it causes dizziness, Low Blood Pressure Answers to your questions about low blood pressure and more! this information to diagnose or treat a health problem or disease without consulting with a All about low blood pressure Find out what causes low blood pressure and what you can do about it. interrelated problems that make it difficult to maintain constant blood pressure. Blood & Circulatory Problems: Low Blood Pressure Low blood pressure can be a sign of good health or a warning signal to a health problem. People with high fitness levels tend to have lower blood pressures Low blood pressure - WebMD But low blood pressure can be a sign of an underlying problem -- especially in the elderly -- where it may cause inadequate blood flow to the heart, brain, Low Blood Pressure (hypotension) Low blood pressure (hypotension) generally refers to numbers less than 100/60. Low blood pressure is rarely a problem and in most cases it is beneficial. Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and Learn about low blood pressure (hypotension) is blood pressure below normal. Low blood pressure symptoms may include: lightheadedness, dizziness, Low blood pressure (hypotension) - MayoClinic.com Low blood pressure, also called hypotension, would seem to be something to strive for. is a well-known risk factor for heart disease and other problems. Low blood pressure (hypotension): Causes - MayoClinic.com Heart problems. Some heart conditions that can lead to low blood pressure include extremely low heart rate (bradycardia), heart valve problems, heart attack |
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