The Boundary Between Conducting Zone and Respiratory Zone Structures Occurs

Question

The boundary between conducting zone and respiratory zone structures occurs at the .
A) terminal bronchiole/respiratory bronchiole junction.
B) secondary bronchi/tertiary bronchi junction
C) tertiary bronchi/bronchiole junction
D) tracheal/main (primary) bronchi junction

Accepted Answer

The boundary between the conducting zone and the respiratory zone in the respiratory system is at the terminal bronchiole/respiratory bronchiole junction. The conducting zone includes structures that facilitate the movement of air without gas exchange, such as the trachea and bronchi, ending at the terminal bronchioles. The respiratory zone begins with the respiratory bronchioles, where gas exchange starts to occur, extending through the alveolar ducts and alveoli.