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

Question : Diffusion of gases occurs in the alveolar region only and n

1.	Question : Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Wht ?
Answer» Solution :Because only alvelor regionis MADE up of squamous epithelium which ENABLES diffusion of gases. For efficient exchange of gases, RESPIRATORY SURFACE (alveolar walls) must have- (i) thin, moist, permeable surface (ii) it must be very large (III) it must be highly vascular. Only alveolar walls have these characteristics