Final answer:
Glycogen, the storage form of glucose, is predominantly stored in the liver and muscle cells. The liver's glycogen is critical for blood glucose management, while muscle glycogen provides energy during exercise. These stores allow the body to maintain glucose levels during fasting or physical activity.
Step-by-step explanation:
Glycogen is the primary storage form of glucose in humans and other vertebrates, akin to starch in plants. This highly branched molecule is typically stored in the body's liver and muscle cells. In the liver, it represents about 4%-8% by weight of the tissue, making it a significant reservoir for maintaining blood glucose levels.
Muscle cells, containing about 0.5% -1.0%, store about 70% of the body's total glycogen due to their large mass. Glycogen provides a quick source of energy during times of fasting or vigorous exercise, undergoing glycogenolysis to release glucose into the bloodstream.