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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 is a poisonous gas and it binds to haemoglobin of the blood more readily (about 200 times) than oxygen to form carboxy haemoglobin.
`Hb+CO iff underset(" Carboxy haemoglobin")(HbCO)`
The presence of CO, therefore, reduces the amount of the haemoglobin available in the blood for the transport of oxygen to the body cells.
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