Which tissue component is typically essential for forming glandular or mucosal surfaces and would be missing if the epithelium is absent?

• A. Epithelium
• B. Muscle
• C. Nerve
• D. Cartilage

Answer: (A)

Epithelial tissue is what forms glandular and mucosal surfaces. Epithelial cells line body cavities and passages and can specialize to create glands; they also make up the mucosal lining that covers surfaces such as the gastrointestinal and respiratory tracts. This lining provides the protective barrier, selective permeability, and secretion that characterize mucosa and glands. If the epithelium were absent, those surfaces would not exist—the underlying tissues would remain, but there would be no lining to form mucosa or glands. The other tissues—muscle, nerve, cartilage—have different roles (movement, signaling, support) and do not create glandular or mucosal surfaces, so they wouldn’t substitute for epithelium in forming those surfaces.