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Explain giving reasons. 'The presence of...

Explain giving reasons. 'The presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells'.

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CO combines with haemoglobin of the red blood corpuscles (RBC) about 200 times more easily than oxygen to form carboxyhemoglobin reversibly as follows:
`Hb+CO hArr HbCO`
Thus, it is not able to combine with oxygen to form oxyhemoglobin and transport of oxygen to different body cells cannot take place
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