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NTA AbhyasNTA Abhyas 2020Structural Organisation in Animals
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All cells in the epithelium are held together with little intercellular material. In nearly all animal tissues, specialised junctions provide both structural and functional links between its cells. Three types of cell junctions are found in the epithelium and other tissues. These are called as tight, adhering and gap junctions. Tight junctions help to stop substances from leaking across a tissue. Adhering junctions perform cementing to keep neighbouring cells together. 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.