It is known that exposure to carbon monoxide is harmful to animals because

(a) it reduces $C O_{2}$ transport

(b) it reduces $O_{2}$ transport

(c) it increases $C O_{2}$ transport

(d) it increases $O_{2}$ transport

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Solution

(b) Haemoglobin consist of a protein globin and pigment here. The four portion of iron in name combine with molecule of oxygen. It is an easy reversible reaction to form oxyhaemoglobin

$H b + O_{2} ⇌ H b O_{2}$

Whereas, the complex formed by the reaction of carbon monooxide and haemoglobin is incredibly strong

$H b + C O (H a e m o g l o b i n) \to H b C O (C a r b o x y h a e m o g l o b i n)$

As a result of this strong between the haemoglobin and carbon monooxide the haemoglobin looses its affinity to oxygen thus may lead to choking or even death.

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