Glucagon is secreted to stimulate release of stored glucose.
Glucose is required by body for production of ATP, which is the energy currency of cell. Source of glucose in body is either from diet (exogenous) or by production of glucose from liver (endogenous). In case of hypoglycemia, which is low blood sugar, body needs to have glucose from inside the body. This problem is solved by pancreatic hormone glucagon.
It is secreted by alpha cells in pancreas. It acts by stimulating liver to produce more glucose. Also, the produced glucose is released in blood, from where it is provided to different organs in body. Another hormone from pancreas, i.e. insulin, decreases blood sugar by stimulating uptake of glucose by cells.
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