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How does carbon monoxide, a poisonous gas emitted by automobiles, prevent transport of oxygen into the body tissues?

1. By destroying the haemoglobin
2. By forming a stable compound with haemoglobin
3. By obstructing the reaction of oxygen with haemoglobin
4. By changing oxygen into carbon dioxide.

Correct answer: By forming a stable compound with haemoglobin

Solution

Carbon monoxide binds with haemoglobin to form carboxyhaemoglobin, a stable compound, which prevents haemoglobin from carrying oxygen to body tissues.

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