Read the following statements (I-IV) regarding cell junctions in epithelial tissues.
(I) Tight junctions prevent leakage of substances across a tissue by forming seals near the apical surface of epithelial cells.
(II) Gap junctions allow rapid communication between adjacent cells by enabling direct transfer of ions and small molecules through protein-lined channels.
(III) Adhering junctions perform cementing to keep neighbouring cells together.
(IV) All three cell-junctions (tight, adhering and gap) are present in epithelial tissues and contribute to structural integrity and coordinated function.
Which of the above statements are correct?
Text Solution
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• Tight junctions form barriers to prevent leakage of substances across the cells.
• Gap junctions enable ion/small molecule transfer between the neighbouring cells of tissues.
• Adhering junctions perform cementing to keep neighbouring cells together.
• All cell-junctions are present in epithelial tissues and function together.
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