Starting from the nasal cavity to the bronchioles all includes the air conducting pathway, while the alveoli, alveolar sac, alveolar ducts and the bronchioles attached to the alveoli are respiratory zone.
Explanation:
The air conducting zone carries oxygen and releases carbon dioxide only. While the respiratory zone exchange the oxygen and carbon dioxide with the blood through the blood capillaries. These blood capillaries surround the alveoli and helps in exchange of gases by the process of diffusion.
In the conducting zone no gas exchange occurs, only they conduct the oxygen and carbon dioxide in and out of the respiratory system.
