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Biological Membrane (Fluid Mosaic Model (theory of cell membrane structure…
Biological Membrane
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Diffusion
movement of molecules from an area of high concentration to an area of low concentration; it does not involve ATP.
Facilitated diffusion
diffusion across a partially permeable membrane via protein channels or carriers; it does not involve ATP.
osmosis
passage of water molecules down their water potential gradient, across a partially permeable membrane.
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Active transport
the movement of substances against their concentration gradient, across a plasma membrane, using ATP and protein carriers.
Endocytosis
bulk transport of molecules, too large to pass through a plasma membrane even via channel or carrier proteins, into a cell.
Exocytosis
bulk transport of molecules, too large to pass through a plasma membrane even via channel or carrier proteins, out of a cell.
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Plasmolysed
plant cell where the contents have shrunk due to loss of water by osmosis and the plasma membrane has separated from the cell wall.
Turgid
a swollen state of plant cells that have taken in water by osmosis and reached their maximum state of swelling.
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