CBSE Class 10 Answered

The beta cells present in islets of Langerhans of pancreas produce the hormone insulin. The beta cells are stimulated to produce and secrete insulin when blood glucose levels start rising - eg. after eating. Actually, there is always a low level of insulin being secreted, but insulin secretion jumps as blood glucose rises. By contrast, when blood glucose levels fall, insulin secretion drops. Insulin stimulates a variety of different body cells to absorb glucose from the bloodstream, thus reducing the overall glucose level. Liver cells also absorb blood glucose which it stores as glycogen.