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 - WebMD
Learn about low blood pressure, also known as hypotension. Low blood pressure can be a sign of good health -- but in the elderly, it can be a sign of

Ask the Experts: Fitness: Exercise and Low Blood Pressure on
Learn what precautions people with low blood pressure should take when exercising from MedicineNet's expert medical doctors and healthcare professionals.

Fainting: Low Blood Pressure: Merck Manual Home Edition
When exercise stops, the heart rate (and the amount of blood pumped) begins to decrease It is caused by orthostatic hypotension (see Low Blood Pressure:

Low Blood Pressure: USC Care
Dizziness, Fainting Could Point to Low Blood Pressure exercise (particularly exercise that improves muscle tone in the lower legs), or wearing support

Cardiovascular fitness: lifeclinic
Low-intensity activities, burning 150â“240 calories an hour: . Related articles. Study Indicates Exercise Can Lower Blood Pressure in Women, Too

Blood pressure (low) Introduction - Health encyclopaedia - NHS Direct
When you exercise, or you are stressed or anxious, your blood pressure will increase. If you have low blood pressure, to a certain degree you have some

Low blood pressure (hypotension) - MayoClinic.com
And it's true that for some people â” those who exercise and are in top physical condition â” low blood pressure is a sign of health and fitness.

Low blood pressure (hypotension): Causes - MayoClinic.com
Causes of low blood pressure vary Athletes and people who exercise regularly tend to have lower blood pressure than do people who aren't as fit.

Histamine tied to changes in blood pressure during exercise
While fainting after exercise, a condition called syncope, can indicate a serious heart disorder, most cases are linked to low blood pressure and low blood

Blood Pressure, A Doctor's Practical Guide With Insider's Tips
Does low blood pressure cause symptoms? Or is it another silent killer? . Exercise High Blood Pressure â¦Huff And Puff To Better Health

Low Levels Of Exercise Can Drive Down Blood Pressure
Even low levels of weekly exercise can drive down blood pressure and boost overall fitness according to new research for the University of Ulster.

Exercise : as treatment to manage Blood Pressure
Nearly all exercises lower blood pressure. Endurance exercise such as walking, Breathing more rapidly, even with low levels of exercise, and sweating

Low Blood Pressure (hypotension)
In most people low blood pressure isn't cause for concern unless it results in Injuries Best Ab and Core Strength ExercisesBody Composition and Body Fat

Even Low Levels Of Weekly Exercise Drive Down Blood Pressure
Even low levels of weekly exercise drive down blood pressure and boost overall fitness, suggests a small new study. To stave off ill health,

Ask the Expert About High Blood Pressure
what constitutes high blood pressure been lowered and should I be worried? more. Blood Pressure and Exercise, Low Blood Pressure. What happens to my blood

Low blood pressure (hypotension) - CNN.com
Low blood pressure can be a boon when it results from a healthy lifestyle. Athletes and people who exercise regularly, for example, tend to have lower blood

Low blood pressure a cause of poor exercise capacity? - Heart
Low blood pressure a cause of poor exercise capacity? This forum is for questions and support regarding heart issues such as: Angina, Angioplasty,


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