Glycogen - Definition

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Definition


Glycogen is a carbohydrate consisting of a long chain of many glucose molecules. Glycogen is the stored form of glucose and is stored mainly in the liver and muscles from blood glucose during a reaction called glycogenesis. In this form, the glucose can be quickly released into the bloodstream by another process called gluconeogenesis. The entire control of these reactions is managed by hormones, mainly by insulin, that act by stimulating the reserves and utilizing the glucose in case of excess sugar in the blood, or by promoting the conversion of glycogen reserves into glucose when blood sugar is too low, mainly by glucagon.

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