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Per NCERT, why do MUSCLE CRAMPS occur during sudden vigorous activity?
AMitochondria explode
BBones bend
CWhen oxygen is insufficient, pyruvate is converted to LACTIC ACID in muscle cells — accumulation causes cramps
DMuscles run out of glucose
Answer & Solution
Correct answer: C. When oxygen is insufficient, pyruvate is converted to LACTIC ACID in muscle cells — accumulation causes cramps
Per NCERT §5.3, low oxygen → lactic acid build-up → muscle cramps. Replenishing oxygen clears the lactic acid.
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