Tissues common to trachea and bronchus walls

Steps:

• Identify trachea structure: C-shaped cartilage rings provide support, ciliated pseudostratified epithelium traps particles, no smooth muscle present.
• Identify bronchus structure: irregular cartilage plates for rigidity, ciliated epithelium for clearance, smooth muscle for constriction.
• Determine shared tissues: both have cartilage for structural support and ciliated epithelium for mucociliary action.
• Select option matching presence in both: cartilage ✓, ciliated epithelium ✓, smooth muscle ✗.

Why A is correct:

• Trachea and bronchi both feature hyaline cartilage for preventing collapse and ciliated epithelium for airway protection, per respiratory anatomy definitions.

Why the others are wrong:

• B: Smooth muscle ✓ is incorrect, as trachea lacks it.
• C: Ciliated epithelium ✗ is incorrect, as it lines both structures.
• D: All ✗ is incorrect, as cartilage and ciliated epithelium are present.

Final answer: A