Where does gas exchange occur in the human respiratory system?

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In the ventricle

Across the walls of Alveoli

In the lungs

In the nostrils

answer is B.

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Detailed Solution

Alveoli are microscopic balloon-like structures embedded with capillaries that allow respiratory gaseous exchange via diffusion. Each lung contains approximately 300 million alveoli that are involved in respiratory gaseous exchange.
The air we breathe enters the lungs via the windpipe and is then exchanged across the alveolar walls.

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