Cell-cell junctions · USMLE Step 1

In which scenario is a hemidesmosome most critical for normal tissue function?

  1. Between two adjacent epithelial cells in the intestine for barrier function
  2. Connecting basal epithelial cells to the underlying basement membrane
  3. Allowing cardiac myocytes to synchronize contraction
  4. Permitting paracellular diffusion of water in kidney proximal tubule
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Correct answer: Connecting basal epithelial cells to the underlying basement membrane

Hemidesmosomes anchor basal epithelial cells to the basement membrane via integrin-mediated linkage to intermediate filaments — a key for stable attachment of epithelia to underlying connective tissue.

Difficulty: Medium Question 16 of 20

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