Respiratory zone
The respiratory zone is the site of O2 and CO2 exchange with the blood.The respiratory bronchioles and the alveolar ducts are responsible for 10% of the gas exchange. The alveoli are responsible for the other 90%.
| Respiratory system | Edit |
| Nose - Nasal cavity - Pharynx - Larynx - Trachea - Lungs - Conducting zone - Respiratory zone |