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TIGHT JUNCTIONS
DEMOSOMES
GAP JUNCTIONS
TIGHT JUNCTIONS, DEMOSOMES, and GAP JUNCTIONS
• series of integral protein molecules fuse together, forming an impermeable junction that encircles the cell
• prevent molecules from passing through extracellular space
• Anchoring junctions
• couplings scattered on the sides of cells that prevent separation
• bind neighboring cells as well as contribute to strong network of "guy-wires"
• Communicating junction that allows chemical substances to pass between adjacent cells
• connected by hollow cylinders composed of transmembrane proteins
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