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Question

CO is toxic because it forms complex with _________ in the blood.

A
carbohydrate
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B
protein
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C
haemoglobin
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D
none of these
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Solution

The correct option is C haemoglobin
Carbon monoxide binds very strongly to the iron in hemoglobin. Once carbon monoxide attaches, it is very difficult to release. While breathing in carbon monoxide, it sticks to your hemoglobin and takes up all of the oxygen-binding sites. Eventually, blood loses all of its ability to transport oxygen and will cause unconsciousness.

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