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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Virtual Library arranged by Dewey 600-628 Technology, Health
BrainPOP.com - Health: All About Your Body and How It Works. Pick a movie to watch. High Blood Pressure - Hypertension from Franklin Institute Online.

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Colour
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Nothing is more cliched, in a bad-B-movie sort of way, than sneezing just when . pressure from the blood leaving your lower half of your body will go to

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BrainPop Movie on the Urinary System High Blood Pressure. http://www.americanheart.org/ General Resources Center for Disease Control and Prevention.

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Hypertension is high blood pressure and can be caused by foods that are BrainPOP Jr. provides educational movies and homework help for K-3 students.

respiratory system
The primary function of the respiratory system is to supply the blood with oxygen in carbon dioxide (CO2) that is produced as a In this BrainPOP movie,

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04.04.03: Simple Machines, Engines and the Environment
Again, letâ™s take a look at the Brainpop movie about the inclined plane. . Carbon Monoxide (CO) - Impairs the flow of blood to the brain and other parts

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The respiratory system inhales and exhales due to pressure from the diaphragm. Teacher and students should view the Brain POP movie, Respiration,

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What a bloody movie! Thatâ™s right - Tim and Moby introduce you to blood, your bodyâ™s liquid messenger, in this BrainPOP movie. Youâ™ll learn why people give

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See what blood pressure is all about in this BrainPOP movie. Blood Types In this BrainPOP movie, Tim and Moby introduce you to the complex world of blood


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