Multiple choice

Muscle fatigue occurs due to the accumulation of ________.

  1. Pyruvic acid

  2. Lactic acid

  3. Oxaloacetic acid

  4. Uric acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During intense anaerobic exercise, muscle cells produce lactic acid as a byproduct of glycolysis when oxygen supply is insufficient. This accumulation leads to muscle fatigue, burning sensation, and reduced performance. Pyruvic acid (A) is a precursor converted to lactic acid, oxaloacetic acid (C) is part of the Krebs cycle, and uric acid (D) is a waste product from nucleic acid breakdown.

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