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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Altitude Sickness and Atmospheric Pressure Altitude sickness is caused by the lack of oxygen in the air available for breathing . Procardia^, a blood pressure medication, has received considerable The effect of altitude on blood pressure in the Assir Province of Small but significant increases in systolic blood pressure (SBP) and diastolic blood pressure (DBP) were observed in high-altitude residents (112 and 75 mm Race specific altitude effects on blood pressure Altitude affects blood pressure (BP) depending on duration and absolute altitude of exposure. Until now changes in BP during exposure to altitude were Altitude influence on Health Certain medical conditions such as asthma and high blood pressure can be aggravated by altitude. If you use a little common sense and do some preparation, IngentaConnect High Altitude and Blood Pressure in Children Blood pressure of the children attending primary schools in Izmir (sea level: n = 425) and Van (altitude: 1725 m, n = 291) were measured by mercurial High Blood Pressure and Altitude - High & Low Blood Re: High Blood Pressure and Altitude Glenda Emanuel 20:32:00 1/05/00 (2). Re: High Blood Pressure and Altitude Merry Roloff 18:23:07 6/18/00 (0) Climate, altitude, and blood pressure | Human Biology | Find Climate, altitude, and blood pressure from Human Biology in Reference provided free by Find Articles. Altitude sickness Altitude sickness is the name given to the physiological and symptomatic People with high blood pressure. People with a tendency to sleep apnoea. High Blood Pressure and High Altitude Living - Heart Disease - MedHelp This is a discussion on MedHelp about High Blood Pressure and High Altitude Living. Community members of MedHelp provide help, support, guidance and Climate, altitude, and blood pressure. The effects of climate and altitude on casual blood pressure are examined from the perspectives of initial exposure, acclimatization, long-term residence, Human Biological Adaptability: Adapting to High Altitude However, the air pressure is 30% lower at the higher altitude due to the fact Pulse rate and blood pressure go up sharply as our hearts pump harder to |
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