Insulin is a hormone that comes from the pancreas, a gland situated behind and below the stomach. The pancreas secretes insulin into the bloodstream.
The insulin circulates, enabling sugar to enter your cells. Insulin also lowers the amount of sugar in your bloodstream.
Also your blood sugar level drops, so does the secretion of insulin from your pancreas.
The role of glucose in your body
Medical experts tell us that glucose… a sugar …is a main source of energy for the cells that make up muscles and other tissues. Glucose comes from two major sources: food and your liver.
Sugar is absorbed into the bloodstream, where it enters cells with the help of insulin. Your liver stores and makes glucose. When your insulin levels are low, such as when you haven’t eaten in a while, the liver metabolizes stored glycogen into glucose to keep your glucose level within a normal range.
Source Dr. Aisha Rashid Lukwago of Clinic on AIDS Research