CHOLESTEROL : | |||||||||||||
a fatty substance in animal tissue that is an essential component of cell membranes, certain hormones, and nerve fiber insulation. Cholesterol is manufactured by the liver, and is also present in certain foods. There are two primary types of cholesterol in the blood, low-density lipoprotein (LDL), which is considered a risk factor for heart disease; and high-density lipoprotein (HDL), which is considered protective.
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