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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Low Blood Pressure - What is Low Blood Pressure - Is Low Blood With very few exceptions, chronic blood pressure below 120/80 is not dangerous. Low blood pressure is usually considered dangerous only when it causes What Is Normal Blood Pressure? Look at a chart of blood pressure readings to see if your blood pressure is normal or too high. Note: Blood pressure that is too low can be dangerous. Is Low Blood Pressure Dangerous? - Associated Content Check out Is Low Blood Pressure Dangerous? - Submitted by Cheryl Carpenter at Associated Content. Is low blood pressure anything to be concerned about? - Yahoo! UK If its a one off then no, but if its regular then yes, it can be just as dangerous as high blood pressure. Low blood pressure can lead to amny things such what is considered dangerous low blood pressure? I don't know the dangerous low blood pressure. It's all about the symptoms that you are having when you have this low blood pressure. Low blood pressure (hypotension) - CNN.com Many people who have low blood pressure (hypotension) are healthy and have no signs On the other hand, a sudden fall in blood pressure can be dangerous. Can low blood pressure be dangerous? - The Boston Globe My blood pressure is low: 90 over 60. Is there anything I can do to raise it? DC, Brookline. Low blood pressure (hypotension): Causes - MayoClinic.com On the other hand, a sudden fall in blood pressure can be dangerous. Doctors often break down low blood pressure (hypotension) into different categories Ask the Expert About High Blood Pressure Blood Pressure and Exercise, Low Blood Pressure. What happens to my blood pressure during exercise? more. Is low blood pressure dangerous? Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and Learn about low blood pressure (hypotension) is blood pressure below normal. In some individuals, the heart rate can become dangerously slow even with Your High Blood Pressure Questions Answered â” Low Blood Pressure Is low blood pressure dangerous, and how low is too low? Low blood pressure is generally considered dangerous when it drops suddenly or is accompanied |
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