First slide

Air Pollution and its Control

Question

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

Moderate

A

By destroying the haemoglobin
B

By forming a stable compound with haemoglobin
C

By obstructing the reaction of oxygen with haemoglobin
D

By changing oxygen into carbon dioxide

Solution

Carbon monoxide combines with hemoglobin to form carboxyhemoglobin at any or all of the oxygen-binding sites of hemoglobin, and also acts to increase the stability of the bond between hemoglobin and oxygen, reducing the ability of the hemoglobin molecule to release oxygen bound to other oxygen-binding sites.

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