Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to:

ethanol

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acetic acid

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lactic acid

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carbon dioxide

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Solution

The correct option is C lactic acid
Correct answer: (d) lactic acid.
Due to the lack of oxygen, the muscle cells undergo anaerobic respiration where the glucose is first oxidised into pyruvate, this pyruvate is then incompletely oxidised to form the lactic acid.
The accumulation of lactic acid in the muscles causes muscle cramps.

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