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When muscles lack oxygen, formation of which substance can cause pain?

Answer and explanation

Correct answer: Lactic acid

During strenuous exercise, the oxygen supply to working muscles may become insufficient for aerobic respiration. Muscle cells then obtain some energy by anaerobic breakdown of glucose, producing lactic acid. Its temporary accumulation is associated with fatigue, pain or cramps. Therefore, option A is correct. Glucose is the starting fuel, starch is a storage carbohydrate, and bile is a digestive secretion, so none of those is the substance described.

Related tags

Anaerobic-RespirationLactic-AcidMusclesEnergyLife ProcessesWorld Of LivingScienceClass 10 Mcq

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