Final answer:
Insulin is a hormone that regulates blood glucose levels in the body by promoting the absorption of glucose into cells.
Step-by-step explanation:
Insulin is a hormone that regulates blood glucose levels in the body. It is produced by the pancreas and helps cells take up glucose from the blood, thereby decreasing the blood glucose level. Insulin promotes the absorption of glucose into liver, fat, and muscle cells, where it is converted into glycogen or fats.