carbon monooxidehas greater afffinity for haemoglobin as compare to oxygen

Haemoglobin bind and transport the oxygen to each and every part of the body. But the carbon monoxide has 210 time greater affinity for the haemoglobin. Hence, when there are both oxygen and carbon monoxide. It is carbon monoxide, which bind with the haemoglobin. Which result in the symptoms of the carbon monoxide poisoning.

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affinity is determined by fitting in active site of enzyme or other compound,here hemoglobin,
CO binding is more perfect than O2 So CO bind more when both are present...
so its affinity is more
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