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Cell Junctions | Cells | MCAT | Khan Academy

Cell junctions are connections between cells that occur in epithelial tissue. There are three main types of cell junctions: tight junctions, desmosomes, and gap junctions. Tight junctions form a watertight seal that prevents water and ions from passing between cells. Desmosomes are like spot welds that hold cells together and allow water, ions, and other small molecules to pass through. Gap junctions are tunnels that connect cells and are found in cells that require the propagation of electrical signals.
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