Glycogenolysis is the biochemical process through which the body breaks down glycogen, a stored form of glucose, into individual glucose molecules. This process primarily occurs in the liver and muscle tissues, providing energy during periods of fasting or intense physical activity. During glycogenolysis, enzymes such as glycogen phosphorylase cleave the glycogen chains, releasing glucose-1-phosphate. This molecule can then be converted into glucose-6-phosphate, which enters the glycolysis pathway to produce energy. Glycogenolysis is crucial for maintaining blood sugar levels and supplying energy when immediate sources are low.