All of the following structures contain cartilage in their walls except the
A) trachea
B) bronchioles
C) primary bronchi
D) secondary bronchi

Question

Quizplus · Accepted Answer

The bronchioles do not contain cartilage in their walls. Cartilage is present in the wall of the trachea, primary and secondary bronchi, but not in the bronchioles. The absence of cartilage in the walls of the bronchioles allows for greater control over the airway diameter and airflow resistance.

All of the Following Structures Contain Cartilage in Their Walls