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JAMB Biology 1993 Question 45

Question 45

Respiration

Carbon monoxide poisons tissues by

  1. A.constricting the blood vessels
  2. B.killing the cells
  3. C.combining with haemoglobin
  4. D.rupturing the blood vessels.
Show the answer and explanation

Answer: C (combining with haemoglobin)

Explanation

Carbon monoxide binds to haemoglobin much more strongly than oxygen, so blood cannot carry enough oxygen to the tissues.