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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Body temperature, shivering, blood pressure and heart rate during Body temperature, shivering, blood pressure and heart rate during a standard cold stress in Australia and Antarctica. G. M. Budd and N. Warhaft Cold weather, high blood pressure dangerous People with hypertension seem to be more vulnerable to heart attacks when the temperature goes down. CDC Winter Weather | A Prevention Guide to Promote Your Personal Extremely cold temperatures often accompany a winter storm, . If you have heart disease or high blood pressure, follow your doctorâ™s advice about USATODAY.com - With high blood pressure, cold raises risk to heart MUNICH, Germany (AP) â” People with high blood pressure seem to be more vulnerable to heart attacks when the temperature drops, new research shows. Heart Attacks More Likely in Cold Weather -- ThirdAge Have high blood pressure? Beware when the temperature drops. vulnerability that people with high blood pressure have to cold weather and underlines the Cold Weather Raises BP & Heart Attack Risk Cold Weather Raises BP & Heart Attack Risk. As the temperature falls in many parts of the < High Blood Pressure Causes Most Strokes and Heart Attacks University of Florida Health News -- Cold weather hikes blood How much will your blood pressure increase in cold? The answer depends on variables such as the current temperature and wind chill, the temperatures youâ™re Cold Weather Hikes Blood Pressure, UF Scientist Warns When winter arrives and temperatures drop, thereâ™s one place the mercury actually rises â” in blood pressure gauges. A survival mechanism in people and other Science of the Cold How humans deal with and survive extreme cold A naked person will start to feel cold if the surrounding temperature drops overall volume of the circulatory system so increasing the blood pressure. High Blood Pressure and Cold Weather As a result, high blood pressure can result. During cold weather, individuals need more blood to maintain their body temperature which is what leads to an Cold Weather Can Raise Blood Pressure Cold temperatures can raise blood pressure, say University of Florida researchers. |
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