The gas which reacts with haemoglobin by displacing oxygen is:
Correct answer: A. Carbon monoxide
- A. Carbon monoxide
- B. Sulfur dioxide
- C. Carbon dioxide
- D. Methane
Explanation
Carbon monoxide (CO) has an affinity for haemoglobin that is over 200 times greater than that of oxygen. When inhaled, it binds tightly to haemoglobin to form carboxyhaemoglobin, which prevents the transport of oxygen in the blood.
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