Question

Diffusion of gases occur in alveolar region only and not in other parts of respiratory system. why?

Answer 1

Answer:

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. The exchange of gases takes place by simple diffusion because of pressure or concentration differences.

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Answer 2

Explanation:

This is because alveoli is connected to blood vessels which carry O2. Oxygen has higher affinity in air so it diffuses into the air while CO2 has higher affinity in blood so it diffuses into blood. These are all possible because of pressure variations.