| − | '''Glucagon''' is an [[endocrine]] [[hormone]] which acts to raise the level of [[glucose]] in the bloodstream. Glucagon is produced by the [[alpha cells]] of the pancreas, where it is stored until [[hypoglycemia]] occurs. It has an effect opposite that of [[insulin]], which acts to reduce blood glucose levels.
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| − | In the liver, glucagon stimulates the breakdown of [[glycogen]] into [[glucose]], which is then released into the bloodstream. A similar reaction occurs in muscle tissue, although the glucose produced there is used by the muscle and not released. [[Glycogenolysis]] can maintain blood glucose levels for several hours, until the glycogen stores are depleted.
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