How does lungs separate out and utilise only oxygen from rest of gases present in air?

Chemical reaction

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Size of $O_{2}$ is bigger

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Size of $O_{2}$ is smaller

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Diffusion

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Solution

The correct option is D
Diffusion

Diffusion

When air fills our alveoli, by the process of diffusion, only $O_{2}$ in the air is taken into the blood stream while the other gases along with the waste $C O_{2}$ is exhaled. So even though we breathe in $N_{2}$ , but it is exhaled as it is by the body.

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