Assertion A Carbon monoxide mainly causes adverse effects in humans by combining with haemoglobin to...........

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Assertion (A): Carbon monoxide mainly causes adverse effects in humans by combining with haemoglobin to form carboxyhaemoglobin in the blood.

Reason (R): This pevents haeomoglobin from carrying oxygen to the tissues effectively reducing the oxygen carrying capicity of the blood, leading to hypoxia.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

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Explanation:

Carbon monoxide (CO) is a colorless, odorless, and tasteless flammable gas that is slightly less dense than air. It is toxic to animals that use hemoglobin as an oxygen carrier when encountered in concentrations above about 35 ppm, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions. In the atmosphere, it is spatially variable and short lived, having a role in the formation of ground-level ozone.