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Created with Fabric.js 1.4.5 6.7 Extracellular components and connections between cells help coordinate cellular activities Cell Wall of Plants Cell wall:Extracellular structure thatprotects cel and give it its shape.Primary cell wall: relatively thin cell wall secrets by young plantsMiddle lamella, a thin layer of stickypolysaccharides caled peptones that glues adjacent cells together.Secondary cell wall: is deposited insevareal laminated layers and has a strong and durable matrix that offers supportContains plasmodesmata, channels that connect cells The Extra Cellular Matrix (ECM) In animal cells only. The ECM is composed of glycoproteins and carbohydrate-containingmolecules.Collagen: the most abundant glycoprotein in the ECM. Forms strong fibers outside the cellSome ECM are bound to the cells by ECMglycoproteins like fibronectin.The ECM proteins bind to integrins. Integrins are cell-surface receptor proteinsthat are built into the plasma membrane the plasma membranes of neighboring cells are very tightly pressed a giant each other. Prevenst leakage of extracellular fluid across a layer of epithetal cells Tigth Junction Function like rivets fastening cell together into small sheets. These are what attach muscle cells to each other Desmosomes Provide cytoplasmic channels from one cell to another.Consist of membrane proteins that surroun a pore through which small molecules may pass. Gap Junctions
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