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Endocytosis of material into vesicles that move to oposite side of cell and fuse with plasma membrane, releasing material into extracellular space Collagen Family of closely related proteins which forms fibers with high tensile strength Definition of endocytosis Endocytosis, as opposed to exocytosis, refers to a key mechanism by which cells introduce large molecules, small cells, and extracellular particles These are encompassed in an invagination of the eukaryotic plasma membraneExocytosis is the process by which cells excrete waste and other large molecules from the cytoplasm to the cell exterior 49 and therefore is the opposite of endocytosis Exocytosis generates vesicles referred to as secretory or transport vesicles (Chapter 17) 1 Definition of endocytosis and exocytosis