Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

Goblet cells lining the airway constantly release mucus onto the epithelial surface. How does finished mucus leave these cells?

A.Mucin monomers diffuse outward one at a time through aquaporin channels
B.Cilia wring mucus out through pores in the apical membrane
C.Mucus dissolves into the lipid bilayer and crosses directly
D.Mucus packed in secretory vesicles exits when vesicles fuse with the plasma membrane

Explanation

Core Concept

Goblet cells concentrate mucin polymers inside secretory granules that merge with the cell surface, spilling hydrated contents outward. This classic exocytic delivery suits a product far too bulky for protein channels. The granule membrane briefly joins the surface and is later recycled by endocytosis, keeping cell area balanced.

Correct Answer

DMucus packed in secretory vesicles exits when vesicles fuse with the plasma membrane

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