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Question

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

A
It reduces CO2 transport
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B
It reduces O2 transport
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C
It increases CO2 transport
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D
It increases O2 transport
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Solution

The correct option is B It reduces O2 transport
Haemoglobin combines with oxygen. It is an easy reversible reaction to form oxyhaemoglobin.
Hb+O2HbO2
The oxygen is transported to various tissues of the body in the form of oxyhaemoglobin by blood. The binding of haemoglobin with oxygen is affected by the presence of CO. The affinity between CO and haemoglobin is 200 times greater than that of Hb and oxygen. Hence, CO reduces the oxygen transport by haemoglobin as it quickly binds to haemoglobin.

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