The smallest branches of the bronchial tree are:
A) primary bronchi.
B) secondary bronchi.
C) tertiary bronchi.
D) bronchioles.

Question

Quizplus · Accepted Answer

Bronchioles are the smallest branches of the bronchial tree, ranging from 0.5 to 1 mm in diameter. They connect to the alveolar ducts, which lead to the alveolar sacs where gas exchange occurs. The primary, secondary, and tertiary bronchi are larger branches of the bronchial tree that branch off from the trachea, leading to the bronchioles.

The Smallest Branches of the Bronchial Tree Are