The respiratory zone is the only site of gas exchange within the lungs.

Question

Quizplus · Accepted Answer

The respiratory zone, which includes the alveoli and respiratory bronchioles, is the site of gas exchange within the lungs. Oxygen from inhaled air diffuses across the thin walls of the alveoli and into the bloodstream, while carbon dioxide generated by cells in the body diffuses across the alveoli walls and into the alveolar air. Other regions of the lungs, such as the conducting zone (trachea, bronchi, bronchioles), do not participate in gas exchange.

The Respiratory Zone Is the Only Site of Gas Exchange