The combination of a pseudostratified columnar epithelium, a lamina propria of loose connective tissue, and a layer of smooth muscle is found in which respiratory structure?
a. Bronchus
b. Larynx
c. Pulmonary alveolus
d. Bronchiole
e. Trachea
ANS: D
Bronchioles can be distinguished from bronchi because bronchioles lack cartilage.
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