Question

Substance that accumulates in a fatigued muscle is

• A. Pyruvic acid
• B. Lactic acid
• C. CO${}_2$
• D. ADP

Answer 1

The correct option is B Lactic acid

Generally, the glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for the muscle contraction but during vigorous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid. Hence Substance that accumulates in a fatigued muscle is lactic acid.

So, the correct answer is 'Lactic acid'.