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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%.

The respiratory zone represents the 16th through the 23rd division of the respiratory tract.

v • d • e Anatomy: respiratory system

Upper respiratory tract	Nose • Nasal cavity • Pharynx • Larynx

Lower respiratory tract	Trachea • Lungs (Bronchi, Alveoli, Conducting zone, Respiratory zone)

v • d • e Anatomy of torso, respiratory system: Lungs and related structures

lungs	right/left • apex/base/root/hilum • cardiac impression/cardiac notch/lingula borders (anterior, posterior, inferior) surfaces (costal, mediastinal, diaphragmatic) fissures (oblique, horizontal)

conducting zone	trachea (tracheal rings, 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) • visceral pleura • pulmonary ligament • recesses (costomediastinal, costodiaphragmatic) • pleural cavity

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