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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 corpuscies about 300 times more easily than oxygen to form carboxy haemoglobin reversibly as follow :
`Hb + CO hArr HbCO`
Thus it is not able to combine with oxygen to form oxyhaemoglobin and transport of oxygen to different body cell cannot take place .
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