Glycogenesis
Glycogenesis is the conversion of glycogen to glucose using energy from the hydrolysis of ATP. This occurs when there is excess glucose present in the blood. As blood passes through the pancreas, the excess glucose stimulates the production of the hormone insulin which in turn stimulates the conversion of glucose to glycogen for storage in liver cells and muscle cells.
The multistep process involves a series of enzymes and intermediate products to ensure the addition of glucose molecules to glycogen chains which can then be stored[1].
Also see: Gluconeogenesis and Glycolysis.