Where does the exchange of gases take place in the human respiratory system?

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In the lungs

Across the walls of Alveoli

In the nostrils

In the ventricle

answer is B.

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Detailed Solution

The air we breathe passes to the lungs through the windpipe which is then finally exchanged across the walls of the alveoli.
Alveoli are microscopic balloon-like structures embedded with capillaries for respiratory gaseous exchange through diffusion.
Each lung has approximately 300 million alveoli engaged in respiratory gaseous exchange.

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