Biology / Bio 2797 · Atom · ~20 seconds
Glycogen Storage and Mobilization
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Excess glucose is converted to glycogen and stored in liver and muscle, then broken back down to glucose, spending ATP, per Bio 0508, when blood sugar drops.
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Long-distance running draws on stored muscle glycogen once immediately available blood glucose runs low.
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Glycogen storage is limited — once full, further excess glucose converts to fat instead.