Question

Why diffusion occurs in every reason not in other parts of respiratory system?

Answer 1

Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. ... Oxygen-rich air enters the body through the nose and reaches the alveoli. The deoxygenated (carbon dioxide-rich) blood from the body is brought to the heart by the veins.

Answer 2

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$\red\longmapsto\:$ Alveoli are made up of single cell layered epithelium which is provided with blood capillaries.so it is the respiratory area part where diffusion takes place.

$\red\longmapsto\:$ where as the trachea, bronchi and broncioles have multilayered walls without capillary network.So these tubes are only air conducting parts where diffusion does not occur.

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