The document summarizes the mechanism of blood glucose regulation in the human body. It discusses how glucose enters the blood from dietary sources and is absorbed and transported into cells. The pancreas plays a key role by secreting the hormones insulin and glucagon to regulate blood glucose levels. Insulin lowers blood glucose while glucagon increases it. Diabetes occurs when there is either not enough insulin production or cells become resistant to insulin's effects, causing abnormal blood glucose levels. Precise control mechanisms attempt to keep glucose levels within a normal range for good health.