What is a primary function of the basal lamina?

• A. Provides tensile strength to the tissue
• B. Produces mucus
• C. Houses immune cells
• D. Anchors epithelium to underlying connective tissue and regulates cell behavior

Answer: (D)

The basal lamina anchors epithelium to the underlying connective tissue and guides cell behavior through interactions with cell surface receptors. It provides a stable, organized extracellular matrix that epithelial cells attach to via laminin and collagen IV, helping establish cell polarity, influence growth and differentiation, and direct migration when needed. This role is distinct from providing tensile strength (that comes from fibrous connective tissue), producing mucus, or housing immune cells. So the primary function is to secure the epithelial layer and regulate how its cells behave.