Matt Carpenter stands out for what he doesn't wear. Cardinals' Matt Carpenter swings at a pitch in the seventh inning during a game between the St. Louis Cardinals and the Chicago Cubs on April 15, 2012, at Busch Stadium in St. Louis. Photo by Chris Lee, clee@post-dispatch.com.
Exocytosis. Exocytosis is the reverse of endocytosis. Quatities of material are expelled from the cell without ever passing through the membrane as individual molecules. By using the processes of endocytosis and exocytosis, some specialized types of cells move large amounts of bulk material into and out of themselves.ndocystosis, is a general term for the process whereby very large particles of material are wrapped with plasma membrane and moved into the cell in the form of vesicles or vacuoles.
The process of active transport involving membrane vesicles is called endocytosis; it occurs when vesicles assist molecules moving into a cell. Exocytosis is the opposite of endocytosis and happen when molecules leave a cell. Passive transport moves molecules from areas of high concentration to areas of low concentration. Unlike active transport, passive transport does not require energy to accomplish. It occurs via simple diffusion, osmosis or facilitated diffusion. Simple diffusion is the tendency of molecules to spread across an open space, as perfume does in a room. Osmosis is the movement of water across a permeable membrane.