Tissue types and function · USMLE Step 1

Which of the following best describes the role of basement membrane in epithelial tissues?

  1. It provides contractile force to move epithelial sheets
  2. It anchors epithelial cells to the underlying connective tissue
  3. It acts as the direct vascular blood supply for epithelium
  4. It transmits nerve impulses across the epithelial layer
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Correct answer: It anchors epithelial cells to the underlying connective tissue

Basement membrane is a specialized extracellular matrix that lies beneath epithelial layers, separating and anchoring them to underlying connective tissue — essential for structural support and maintenance of tissue integrity.

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