The type of cell junctions that permit direct transfer of ions and small molecules between the adjoining cells of a tissue are

Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules. Tight junctions (also known as occluding junctions) help to stop substances from leaking across a tissue. Adhering junctions perform cementing to keep neighbouring cells together.