Tissues common to trachea and bronchus walls

Steps:

• Identify trachea structure: features smooth muscle, pseudostratified ciliated columnar epithelium with goblet cells, no squamous epithelium.
• Identify bronchus structure: similar to trachea with smooth muscle and goblet cells in epithelium, lacks squamous epithelium.
• Compare tissues: both contain smooth muscle and goblet cells, exclude squamous epithelium.
• Select row matching presences for both: smooth muscle present, squamous not present, goblet cells present.

Why C is correct:

• Anatomy defines trachea and primary bronchi walls with smooth muscle for constriction and goblet cells for mucus in ciliated epithelium, excluding squamous type.

Why the others are wrong:

• A: Lists squamous epithelium as present, but it lines alveoli, not trachea or bronchi.
• B: Falsely omits smooth muscle, essential for airway regulation in both.
• D: Incorrectly marks all as absent, ignoring shared smooth muscle and goblet cells.

Final answer: C