Haemoglobin has maximum affinity with

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(B) Haemoglobin has approximately $250$ times more affinity for carbon monoxide $(CO)$ compared to oxygen $(O_2)$.When $CO$ binds to haemoglobin,it fo

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Carbon monoxide

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(B) Haemoglobin has approximately $250$ times more affinity for carbon monoxide $(CO)$ compared to oxygen $(O_2)$.When $CO$ binds to haemoglobin,it forms a stable,cherry-red compound known as carboxyhaemoglobin $(HbCO)$.This binding prevents oxygen from binding to haemoglobin,leading to hypoxia and potentially fatal carbon monoxide poisoning.

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