What tissue types are separated by the basement membrane?

• A. Muscle and nerve tissue
• B. Epithelium and underlying connective tissue
• C. Cartilage and bone
• D. Endothelium and smooth muscle

Answer: (B)

Basement membranes separate epithelial tissue from the connective tissue that supports it. They’re a thin extracellular matrix layer produced by epithelial cells (basal lamina) and by the underlying connective tissue (reticular lamina), forming the boundary that anchors epithelium to its underlying tissue and helps regulate what moves between them. That makes epithelium and the underlying connective tissue the correct pairing. The other options describe boundaries or interfaces that don’t rely on the basement membrane in the same classic way: muscle and nerve tissues meet in a different arrangement, cartilage and bone are both connective tissues without a single basement-membrane boundary between them, and endothelium is a specialized epithelium lining vessels with additional boundary layers, not the straightforward epithelial–connective-tissue separation.