Respiratory zone
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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%.
The respiratory zone represents the 16th through the 23rd division of the respiratory tract.
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Nose | Nasal cavity | Pharynx | Larynx | Trachea | Lungs | Bronchi | Alveoli | Conducting zone | Respiratory zone
lungs: right, left, lingula, apex, base, root, cardiac notch, cardiac impression, hilum, borders (anterior, posterior, inferior), surfaces (costal, mediastinal, diaphragmatic), fissures (oblique, horizontal)
conducting zone: trachea, carina, bronchi, main bronchus (right, left), lobar/secondary bronchi (eparterial bronchus), segmental/tertiary bronchi (bronchopulmonary segment), bronchiole, terminal bronchiole
respiratory zone: respiratory bronchiole, alveolar duct, alveolus, alveolar-capillary barrier
pleurae: parietal pleura (cervical, costal, mediastinal, diaphragmatic), pulmonary pleura, pulmonary ligament, recesses (costomediastinal, costodiaphragmatic)
