Answer:
This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles. The accumulation of lactic acid in muscles leads to muscle cramps. Hence During heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid. So, the correct answer is 'Lactic acid'.This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles. The accumulation of lactic acid in muscles leads to muscle cramps. Hence During heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid. So, the correct answer lactic acid