CAMLPR Histology Practice Test

What structure is present at the apical surface of the respiratory epithelium?

Microvilli Goblet cells Respiratory cilia Basal bodies

Correct Answer:

Respiratory cilia

Explanation:

Motile cilia on the apical surface drive mucociliary clearance. In the respiratory tract, the epithelium is lined with pseudostratified ciliated columnar cells interspersed with goblet cells, and the coordinated beating of these cilia propels mucus toward the pharynx to remove debris and pathogens. Microvilli are associated with absorptive surfaces and are not the characteristic feature of this epithelium. Goblet cells secrete mucus but are not apical projections themselves. Basal bodies anchor the cilia at the base inside the cell, not on the surface. Therefore, the structure present at the apical surface is the respiratory cilia.

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