Which of these cell junctions form a barrier to the passage of materials? a) plasmodesmata b) desmosomes (anchoring junctions) c) keratin fibers d) gap (communicating) junctions e) tight junctions

E) tight junctions

Explanation:

Tight joints act as barriers that regulate the circulation of water and solutes between the epithelial layers. Tight junctions are classified as a paracellular barrier, which is defined as having no directional discrimination, but movement is largely dependent on solute size and load.

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-lavira : )