Question

Diffusion of oxygen occurs in the alveolar region only and not in the
parts of respiratory system. How do you justify the statement?​

Answer 1

Explanation:

Hence, oxygen diffuses into blood. Simultaneously, carbon dioxide diffuses out of blood and into the alveoli. Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. ... Thus, the alveoli are the sites for gaseous exchange.

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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