differentiate b/w insulin & glucagon?-3mks

Insulin is normally secreted by the beta cells (a type of islet cells) of the pancreas whereas Glucagon is secreted by the alpha cells of the pancreatic islets. The stimulus for insulin secretion is a high blood glucose whereas the stimulus for glucagon secretion is a low blood glucose level. Insulin lowers the high blood glucose levels into the normal range whereas glucagon brings the low blood glucose level to a normal range.