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Before endurance events, athletes will often “carb up.” Where does the body obtain the glucose from broken-down carbohydrates while exercising?
  1. Glycogen stored in muscle tissue
  2. Glucose in the bloodstream
  3. Glucose stored in the liver
  4. Glycogen stored in the muscle tissue and glucose stored in the bloodstream
Explanation
Answer: D - Carbohydrates used during exercise come from glycogen stored in muscle tissue and from glucose in the bloodstream. Carbohydrates are the primary fuel for the production of ATP (adenosine triphosphate), which is a chemical compound required for cells to function. The liver stores glycogen for later use.
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