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 In order to maintain cell size, membrane components must be replaced This is accomplished by the process of exocytosis Opposite to endocytosis, exocytosis involves the formation, transportation, and fusion of internal vesicles with the cell membrane to expel substances from the cellExocytosis is the cellular process in which intracellular vesicles in the cytoplasm fuse with the plasma membrane and release or "secrete" their contents into the extracellular space Exocytosis can be constitutive (occurring all the time) or regulated Constitutive exocytosis is important in transporting proteins like receptors that function in the plasma membraneNoun A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane 'Membrane fusion is a key event in many essential cell processes, such as exocytosis, endocytosis, membrane recycling, protein sorting and transport, fertilization, and cell division' A