Question

multiple choice question
indicate pathway of airflow from the more proximal to the more distal air passageway.
o secondary bronchus → tertiary bronchus → terminal bronchiole → respiratory bronchiole
o terminal bronchiole → tertiary bronchus → secondary bronchus → primary bronchus
o primary bronchus → secondary bronchus → respiratory bronchiole → terminal bronchiole

Explanation:

The respiratory system's airway branches from more proximal (closer to the entrance) to more distal (farther from the entrance). The primary bronchus is the first branch from the trachea. It then divides into secondary bronchi, which further divide into tertiary bronchi. Terminal bronchioles are the last part of the conducting zone, and respiratory bronchioles are part of the respiratory zone (more distal as they are involved in gas exchange).

Answer:

secondary bronchus → tertiary bronchus → terminal bronchiole → respiratory bronchiole