Multiple choice

Muscle fatigue is caused by accumulation of

  1. Pyruvic acid

  2. Lactic acid

  3. Oxalic acid

  4. Uric acid

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Muscle fatigue during intense exercise is primarily caused by lactic acid accumulation. When oxygen supply is insufficient, muscles switch to anaerobic respiration producing lactic acid as a byproduct. This buildup lowers pH, interferes with muscle contraction, and causes the sensation of fatigue and burning.

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