passwella.
Menu

WAEC Biology 2019 Question 10

Question 10

Respiration

Muscle fatigue in the body of an athlete is due to

  1. A.low pH.
  2. B.high oxygen content.
  3. C.accumulation of lactic acid.
  4. D.accumulation of carbonic acid.
Show the answer and explanation

Answer: C (accumulation of lactic acid.)

Explanation

During hard exercise muscles run short of oxygen and respire anaerobically, producing lactic acid. Lactic acid builds up and causes fatigue and cramps.