Glucagon
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Glucagon is a chemical used in the body to stimulate secretion of glucose into the bloodstream. Glucagon itself is produced in the pancreas, where it is stored until hypoglycemia occurs. It has an effect opposite that of insulin, which instead reduces the amount of glucose. Specifically, glucagon breaks down glycogen in the liver into glucose molecules that increase the blood sugar level. Glucagon also has a side effect of creating glucose from proteins, called gluconeogenesis.
References
Colorado State University Hypertexts for Biomedical Sciences
