The oxygen debt must be "paid" off following rigorous muscular activity because

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All of the listed processes contribute to the oxygen debt that must be repaid following rigorous muscular activity. Creatine phosphate is used to rapidly replenish ATP stores and must be regenerated. Lactic acid builds up during anaerobic respiration and must be detoxified. Glycogen stores are depleted during exercise and must be replenished. ATP is required for muscle recovery and must be resynthesized. Therefore, all of the listed choices are necessary to repay the oxygen debt after exercise.

The Oxygen Debt Must Be "Paid" Off Following Rigorous Muscular