1.

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

Answer» for efficient exchange of geses respiratory surface must have certain characteristics such as (i) it must be thin . Moist and permeable to respiratory gases (ii) it must be very large (iii) it must be highly vascular. Only alveolar region has these characteristics . Thus diffusion of gases occurs in this region only.


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