. During heavy exercise, we get cramps in the legs due to the accumulation of

(i)  carbon dioxide          

(ii) lactic acid

(iii) alcohol                     

(iv) water


Best Answer

Correct option: (ii) lactic   acid

Solution: During vigorous physical exercise, anaerobic respiration takes place in human muscles because oxygen is used faster in the muscles compared to its supply by the blood. Thus, sudden buildup of lactic acid poison our muscles and cause muscular cramps.


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