Which of the following changes does not occur as the conducting tubes of the respiratory tree become smaller?
A) Cartilage rings are replaced by irregular plates of cartilage.
B) The lining epithelium thins.
C) Elastin in the walls disappears.
D) Cartilage disappears in the bronchioles.

Question

Quizplus · Accepted Answer

Elastin does not disappear as the conducting tubes become smaller; instead, its presence helps maintain the airways' elasticity and allows them to expand and contract during breathing.

Which of the Following Changes Does Not Occur as the Conducting