A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of

  1. A. lactic acid
  2. B. CO_2
  3. C. pyruvic acid
  4. D. ethanol

Correct Answer: A. lactic acid

Explanation

During vigorous exercise, anaerobic respiration occurs in muscle cells, leading to the accumulation of lactic acid, which causes muscle cramps.

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