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The function of the gap junction is to

1. facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
2. separate two cells from each other.
3. stop substance from leading across a tissue by forming cementing layers between neighbouring cells together.
4. perform osmosis in the cells.

Correct answer: facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.

Solution

Gap junctions form channels between adjacent cells, allowing ions and small molecules to pass directly from one cytoplasm to another. This enables rapid cell-to-cell communication, which matches the correct option.

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