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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Your High Blood Pressure Questions Answered â” Low Blood Pressure Fatigue. Depression. Unusual thirst. There is no specific number at which blood pressure is considered too low. Most doctors consider chronically low blood Low Blood Pressure (hypotension) If you have symptoms of low blood pressure, such as dizziness, weakness, and fatigue, you should be sure to talk with your doctor about other possible Low blood pressure (hypotension): Causes - MayoClinic.com Even mild dehydration can cause weakness, dizziness and fatigue. Doctors often break down low blood pressure (hypotension) into different categories, lifeclinic.com - Low Blood Pressure Other studies have suggested that low blood pressure may be associated with fatigue, weakness, and depression. There may be overlap with the âœchronic Chronic fatigue syndrome - CNN.com Some people with chronic fatigue syndrome may have a low blood pressure disorder that triggers the fainting reflex. In many cases, however, A tilt table test reveals low blood pressure (neurally mediated A tilt table test often reveals low blood pressure (neurally mediated hypotension - NMH) problems in fibromyalgia and chronic fatigue patients. ADRENAL FATIGUE People with low cortisol (as in advance stages of adrenal fatigue) have low blood pressure and reduced reactivity to other body agents that constrict blood Ask an Expert: Low Blood Pressure and Fatigue/Depression I just recently read an article citing a possible correlation between low blood pressure and fatigue/depression. Do you have any more information on this All about low blood pressure Find out what causes low blood pressure and what you can do about it. Fatigue, exercise, or excessive food or alcohol intake may make the symptoms worse Chronic Fatique Syndrome and Blood Pressure: Cryptic Partners? And unfortunately, this particular kind of hypotension, or low blood pressure, cannot be detected by standard blood pressure tests. Addison's disease The disease is characterized by weight loss, muscle weakness, fatigue, low blood pressure, and sometimes darkening of the skin in both exposed and |
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