Glycogen is a large, branched polysaccharide that serves as the primary storage form of glucose in animals and humans, mainly found in the liver and skeletal muscles. It acts as an energy reserve that can be quickly mobilized when the body needs glucose, especially during physical activity or between meals. When blood sugar levels drop, glycogen is broken down through a process called glycogenolysis to release glucose into the bloodstream. This makes glycogen essential for maintaining stable blood sugar levels and providing quick energy during periods of high demand.
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