Diffusion of gases occurs in the alveolar reg | vedclass

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Question

(B) Each alveolus is composed of highly permeable and thin layers of squamous epithelial cells. Similarly,the blood capillaries consist of thin layers

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Alveoli have a large surface area and thin,permeable membranes.

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(B) Each alveolus is composed of highly permeable and thin layers of squamous epithelial cells. Similarly,the blood capillaries consist of thin layers of squamous epithelial cells.The exchange of $O_2$ and $CO_2$ occurs between the blood capillaries surrounding the alveoli and the air present in the alveoli.This exchange happens via simple diffusion due to pressure or concentration gradients. The barrier between the alveoli and the capillaries is extremely thin,allowing gases to diffuse from an area of higher partial pressure to an area of lower partial pressure.The venous blood reaching the alveoli has a lower partial pressure of $O_2$ and a higher partial pressure of $CO_2$ compared to the alveolar air. Consequently,oxygen diffuses into the blood,while carbon dioxide diffuses out of the blood into the alveoli.

Diffusion of gases occurs in the alveolar region only and not in the other parts of the respiratory system. Why?

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