Question

Muscles get fatigue due to the accumulation of

• A. Lactic acid
• B. ATP
• C. Phosphate molecules
• D. $C{O}_2$

Answer 1

The correct option is A Lactic acid

The glucose present in the blood act as an instant source of energy for the muscles. The glucose is stored in the muscles in form of glycogen. The glycogen is changed into glucose by glycogenolysis and the glucose produces energy in form of ATP to the muscle by the process of glycolysis. In case of strenuous exercise, the muscles respire anaerobically and lead to produce lactic acid and cause muscle cramps and fatigue.

So, the correct answer is option A.