Adrenaline also plays a role in increasing bloodglucose concentration. At times of stress and excitement, adrenaline is produced and released by the adrenal glands, which lie above the kidneys.
Adrenaline has two major functions to increase bloodglucose concentration, including attaching to protein receptors on the cell-surfacemembrane of target cells and activating enzymes that causes the breakdown of glycogen to glucose in the liver.