Which of the Following Would Have the Smallest Diameter

Question

Which of the following would have the smallest diameter?
A)the pharynx
B)the trachea
C)the bronchi
D)the bronchioles

Accepted Answer

The bronchioles have the smallest diameter among the given structures. As air travels down the respiratory pathway, it goes from larger structures to smaller ones, with the bronchioles being the final branches that lead to the alveoli.