What is the function of goblet cells and where are they most abundant?

• A. Secrete mucins to form mucus; abundant in respiratory and intestinal mucosa
• B. Absorb nutrients; abundant in kidney tubules
• C. Secrete digestive enzymes; abundant in pancreas
• D. Form tight junctions; abundant in skin

Answer: (A)

Goblet cells are mucus-producing cells scattered among the epithelial lining. Their main job is to secrete mucins, which mix with water to form mucus. This mucus coats and protects the surface, traps dust and microbes, and keeps the lining moist. Because the respiratory and gastrointestinal tracts are constantly exposed to air, debris, and digestive contents, goblet cells are especially abundant in these mucous membranes, providing a protective, lubricating layer.

Other options describe functions not carried out by goblet cells—nutrient absorption, digestive enzyme secretion, or forming cell junctions—and point to tissues where goblet cells are not a primary feature (like kidney tubules or skin).