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Notes: Intercellular Junctions Main Concept: How cells interact, communicate, and connect with eachother. Plants have plasmodesmata that pass through adjoining cell walls. Animal cells have tight junctions, desmonsomes, and gap junctions. Vocab: Plasmodesmata: channels in which plant cell walls are perforated with Tight Junctions: membranes of neighboring cells are tightly pressed against each other, bound by specific proteins. Prevent leakage of estracellular fluid across epithelial cells. Desmonsomes: (aka. Anchoring junctions) function like rivets, fastening cells together into strong sheets. Filaments made of study keratin proteins anchor them in cytoplasm. Gap Junctions: (aka. Communicating junctions) provide cytoplasmic channels from one cell to the next. Special membrane proteinsthat surround a pore through which ions, sugars, a. acids, etc. pass. Necessary for communication b/w cells. Plants: Functions of plasmadoesmata: allow cytosol to pass through, which connects cells, to unify plant inot one living thing, water and small solutes pass from cell to cell, macromolecules pass through and are transported on cytoskeleton. Functions of plasma membranes: line the channel of each plamodesma and thus are continuous. Animals: Tight Junctions, desmonsomes, and gap junctions. All 3 types are common in epithelial tissue which lines the external and internal surfaces of the body.