Question

Diffusion of gases occur in the alveolar region only & not in the other parts of
respiratory system. Why?​

Answer 1

Answer:

it is densely surrounded by blood vessels and are very thin in nature therefore provides high rate of diffusion

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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