(i) Stored food: Glycogen is stored in the animal body as stored food.
(ii) Glucose production: Glucose is produced from liver glycogen in the process of glycogenesis.
(iii) Muscle energy: Glycogen stored in skeletal and cardiac muscles provides extra energy to muscles.
(iv) Regulation of blood volume: It regulates blood volume in the body. Increases blood glucose levels by breaking down liver glycogen. Dr. Siddiq Publications
(v) Formation of suspension: It forms colloidal suspension in water.
(vi) Production of Surfactant: Glycogen begins to accumulate in the pulmonary cells of the fetal baby at 23 weeks of gestation. Stored glycogen produces lung surfactant.
(vii) Energy storage: Glycogen production and storage takes place in the liver cells of animals. It acts as a stored energy reservoir secondary to the glucose cycle in the animal body. Dr. Siddiq Publications
(viii) Energy supply to the brain: A small amount of glycogen is stored in brain cells. It powers the conscious brain.