Answer:
The beta cells of the pancreas release insulin.
Explanation:
Insulin is a protein hormone produced in the pancreas, more precisely in cell groups called pancreatic islets. In the islets, there are alpha cells and beta cells, the latter being responsible for the secretion of insulin after a person eats a meal high in glucose, resulting in increased blood glucose levels.
Insulin is related to blood glucose control. This hormone, which acts on virtually every cell in the body, stimulates glucose uptake by the cell.