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JAMB Biology 1987 Question 23

Question 23

Respiration

Fatigue of leg muscles may occur after riding many kilometers on a bicycle because of

  1. A.insufficient glucose
  2. B.excess carbon dioxide
  3. C.excess protein
  4. D.insufficient oxygen.
Show the answer and explanation

Answer: D (insufficient oxygen.)

Explanation

When muscles work hard they cannot get enough oxygen, so they respire anaerobically and lactic acid builds up, causing fatigue.