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Glucagon is an important hormone involved in carbohydrate metabolism. Produced by the pancreas, it is released when blood glucose levels start to fall too low, causing the liver to convert stored glycogen into glucose and release it into the bloodstream, raising blood glucose levels and ultimately preventing the development of hypoglycemia. The action of glucagon is thus opposite to that of insulin, which instructs the body's cells to take in glucose from the blood. However, glucagon also stimulates the release of insulin, so that newly-available glucose in the bloodstream can be taken up and used by insulin-dependent tissues.