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During strenuous exercise, muscle cells respire anaerobically. The product that causes muscle cramps is
Apyruvate
Bethanol
Ccarbon dioxide only
Dlactic acid
Answer & Solution
Correct answer: D. lactic acid
When oxygen is insufficient, pyruvate is converted to lactic acid in muscle cells (anaerobic respiration). Its accumulation causes cramps. Ethanol is the product in yeast, not muscle.
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