Multiple choice

Why does one feel muscular fatigue after strenuous physical work?

  1. Accumulation of urea in the muscle

  2. Accumulation of lactic acid in the muscle

  3. Loss of glucose from the muscle

  4. Lack of oxygen in the muscle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During strenuous exercise, muscles work anaerobically when oxygen supply is insufficient. This produces lactic acid as a byproduct of anaerobic glycolysis. The accumulation of lactic acid in muscle tissue causes fatigue, pain, and the burning sensation during intense physical activity.

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