Which cellular junction in animal tissues forms watertight seals between adjacent epithelial cells, preventing intercellular fluid leakage across tissue layers?
Answer and explanation
Correct answer: B. Tight junction
- Step 1: Review junctional complexes in animal epithelia.
- Step 2: Tight junctions (zonula occludens) form continuous impermeable belts by fusing outer membranes of adjacent cells, sealing intercellular spaces (e.g., intestinal epithelium, blood-brain barrier).
Answer
Tight junction.
Why not the others: Desmosomes provide mechanical anchoring against shearing; gap junctions permit intercellular ionic communication; plasmodesmata are found in plant cell walls.
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