LYCOS RETRIEVER 
Cholesterol: Blood
built 630 days ago
Cholesterol is one of the most widely disseminated organic compounds in the animal kingdom. Almost three hundred years ago, Antonio Vallisnieri observed that gallstones were soluble in turpentine or alcohol. Poulletier de la Salle, some thirty years later, demonstrated that the main constituent of gallstones could be crystallized from alcohol. This substance was thought to be a wax until 1815, when Michel Eugène Chevreul showed that it was not saponifiable and gave it the name "cholesterine" derived from the Greek chole, bile, and steros, solid. Soon thereafter, it was isolated from blood, brain, tumors, and egg yolk. The isolated compounds were shown to be identical.
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Cholesterol is a crystalline substance that is really a steroid. However, because it is soluble in fats rather than water, it is ... classified as a lipid, as fats are. It is found naturally in the brain, nerves, liver, blood, and bile of both humans and vertebrate animals. This is why people who want to decrease their cholesterol levels should consider cutting back on the Quarter Pounders with Cheese, along with other animal products.
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Cholesterol is minimally soluble in water; it cannot dissolve and travel in the water-based bloodstream. Instead, it is transported in the bloodstream by lipoproteins - protein "molecular-suitcases" that are water-soluble and carry cholesterol and triglycerides internally. The apolipoproteins forming the surface of the given lipoprotein particle determine from what cells cholesterol will be removed and to where it will be supplied.
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Cholesterol can build up on the inside the blood vessels of your heart. If too much cholesterol builds up, then the blood cannot flow through to your heart. This can cause a heart attack.
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Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Cholesterol is ... considered a sterol (a combination steroid and alcohol). Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.
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Cholesterol is only one of several lipids (fats) circulating in your blood stream. Triglycerides are an additional form of fat (3 fatty acids plus glycerol) circulating in the blood. Cholesterol and Triglycerides cannot dissolve in water due to being lipids, or fats.
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