Muscle fatigue occurs due to accumulation of___________?
Correct answer: D. Lactic acid
- A. Acidic acid
- B. Butyric acid
- C. Citric acid
- D. Lactic acid
Explanation
During intense exercise, oxygen delivery may not meet demand, so muscle cells rely more on anaerobic glycolysis and convert pyruvate to lactate, traditionally described in basic biology as lactic acid accumulation. Students may choose citric acid because it is associated with cellular respiration, but it is not the product linked with short-term muscle fatigue in this context.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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