Which of the following gases readily combines with the haemoglobin of the blood?
Correct answer: A. Carbon monoxide
- A. Carbon monoxide
- B. Methene
- C. Oxygen
- D. Nitrogen dioxide
Explanation
Carbon monoxide binds haemoglobin to form carboxyhaemoglobin, with an affinity about 200 to 250 times greater than oxygen, reducing oxygen transport to tissues. Students may choose oxygen because it normally binds haemoglobin, but the question asks which gas binds unusually strongly and dangerously.
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