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Glycogen is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi. The polysaccharide structure represents the main storage form of glucose in the body.or the next 8â12 hours, glucose derived from liver glycogen is the primary source of blood glucose used by the rest of the body for fuel. Glucagon, another hormone produced by the pancreas, in many respects serves as a countersignal to insulin.
1 When your body senses that you have extra glucose, it converts the glucose to glycogen by a process called glycogenesis. 2  The glycogen is stored in muscle and liver tissue. 3  As your blood glucose levels begin to run low, your body converts the glycogen back to glucose by a process called glycolysis.nsulin and glucagon are hormones made by the pancreas. 1  Insulin works to move glucose into the cells of the body for energy, remove excess glucose from the blood stream, and convert the excess glucose to glycogen. 2  Glycogen is stored in muscle and liver tissue for later use, when more glucose is needed in the blood.