Question

Feeling of fatigue after running fast for some time is due to

• A. Loss of energy
• B. Accumulation of lactic acid in muscles
• C. Formation of succinic acid
• D. Formation of biuret crystals

Answer 1

The correct option is B Accumulation of lactic acid in muscles

• 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.
  
• Feeling of fatigue after running fast for some time is due to the accumulation of lactic acid in muscles.
  
• So, the correct answer is 'Accumulation of lactic acid in muscles'.