Which one of the following structures is NOT part of the respiratory zone?
A) respiratory bronchioles
B) alveolar ducts
C) alveolar sacs
D) alveoli
E) primary bronchi

Question

Quizplus · Accepted Answer

The primary bronchi are part of the conducting zone, which leads to the respiratory zone. The respiratory zone includes respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli, where gas exchange occurs.

Which One of the Following Structures Is NOT Part of the Respiratory