Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to:
(a) ethanol
(b) carbon dioxide
(c) acetic acid
(d) lactic acid
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Solution
(d) lactic acid
Lack of oxygen in muscles causes accumulation of lactic acid, due to anaerobic respiration. Accumulation of lactic acid leads to cramps in the legs of sprinters.