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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. | |