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Cells160-page23 - cells have receptor proteins molecules...

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Cell - 23 Plasmodesmata Extracellular Matrix The surfaces of animal cell membranes have a variety of substances that are attached to the plasma membrane. These materials form the extracellular matrix. Many of the molecules of the matrix are glycoproteins. Collagen fibers are typically embedded into a network in the matrix, and provide strength. Elastin fibers provide flexibility. The matrix molecules are attached to special membrane proteins. This network is important in cell communication. In addition to the extracellular matrix of animal cells, the plasma membranes of all
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Unformatted text preview: cells have receptor proteins, molecules that chemically detect signals from other cells or chemicals in the environment. For example, hormones often "work" by binding to receptors, or passing through protein channels and binding to chemicals within the cell to direct specific cell functions. Such chemical communications are vital to the functioning of all cells and organisms. We will discuss the membrane proteins in more detail soon....
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