Glucagon is secreted by

Glucagon, a peptide hormone secreted by the pancreas, raises blood glucose levels. Its effect is opposite that of insulin, which lowers blood glucose levels. The pancreas releases glucagon when blood sugar (glucose) levels fall too low. Glucagon causes the liver to conve stored glycogen into glucose, which is released into the bloodstream. High blood glucose levels stimulate the release of insulin. Insulin allows glucose to be taken up and used by insulin-dependent tissues. Thus, glucagon and insulin are pa of a feedback system that keeps blood glucose levels at a stable level.The hormone is synthesized and secreted from alpha cells (a-cells) of the islets of Langerhans, which are located in the endocrine poions of the pancreas.Ref: Ganong&;s review of medical physiology;24th edition; page no-443