During periods of strenuous exercise in mammals, ATP demand exceeds the amount supplied by aerobic respiration. Fermentation produces additional ATP and an "oxygen debt" occurs. The debt is repaid after exercise when oxygen supplies are sufficient to convert a. pyruvate to lactate b. pyruvate to CO2 c. lactate to NADH d. lactate to pyruvate
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option a. pyruvate to lactate .
Explanation:
As During such periods, additional ATP is generated by anaerobic glycolysis. Most of the pyruvic acid produced is converted to lactic acid. About 80% of the lactic acid diffuses from the skeletal muscles and is transported to the liver for conversion back to glucose or glycogen.
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