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The build-up of which substance in muscles during sudden strenuous activity is responsible for causing cramps?

Question
The build-up of which substance in muscles during sudden strenuous activity is responsible for causing cramps?
Glucose
Ethanol
Lactic acid
Glycogen
Answer
Lactic acid
Detailed Explanation
The text explains that the build-up of lactic acid in muscles during sudden activity causes cramps.
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