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Muscle cramps after hard running may be related to formation of which substance?

Answer and explanation

Correct answer: Lactic acid

The governing concept is anaerobic respiration in muscles. During intense running, the oxygen supply may temporarily be insufficient for the muscles’ energy demand. Muscle cells then partially break down glucose without enough oxygen, producing lactic acid and releasing less energy. Accumulation of lactic acid is associated with fatigue and cramps in the school-level explanation. Therefore option A is correct; bile, starch and urea have different biological roles.

Related tags

Lactic AcidMuscle CrampsAnaerobic RespirationExerciseLife ProcessesWorld Of LivingScienceClass 10 Mcq

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