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Intercellular Junctions in Plants • Plasmodesmata: channels in which plant cell walls are perforated with. • Functions of Plasmodesmata include: – Allowing cytosol to pass through, which connects cells to unify plant into one living thing – Water and small solutes pass from cell to cell. – Macromolecules pass through and are transported on cytoskeleton. Plasmodesmata in Plant Cells Intercellular Junctions in Animal Cells • Tight Junctions: Specific proteins bind cell membranes which are pressed against each other. – Function: Tight Junctions prevent extracellular fluid from leaking across epithelial cells. Intercellular Junctions in Animal Cells • Desmonsomes: also known as “anchoring junctions,” desmonsomes are like rivets that fasten cells together. – Desmonsomes are anchored to the cytoplasm by filaments made of keratin proteins. Intercellular Junctions in Animal Cells • Gap Junctions: also known as “communicating junctions,” gap junctions act as cytoplasmic channels between cells. – Function: Each pore is surrounded by membrane proteins which allow ions, sugars, amino acids, and other things cells need to pass from cell to cell. Intercellular Junctions in Animal Cells