Insulin is a hormone made by the ______.

The correct answer is: Pancreas

Insulin is a hormone made by an organ located behind the stomach called the pancreas. It is a peptide hormone secreted by the β cells of the pancreatic islets of Langerhans and maintains normal blood glucose level by facilitating cellular glucose uptake, regulating carbohydrate, lipid and protein metabolism and promoting cell division and growth through its mitogenic effects.