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membrane + transport

Cell membrane and methods of transport

active transport movement of materials across a membrane that requires an input of energy from a cell
cell membrane Also known as the plasma membrane and composed of a bilayer of phospholipids
concentration gradient the region over which there is a change in concentration of a substance
endocytosis the movement of materials into a cell by use of a vesicle
exocytosis the movement of materials out of a cell by use of a vesicle
hydrophilic water loving; soluble in water
hydrophobic water hating; not soluble in water
osmosis the diffusion of water across a semipermeable membrane
passive transport movement of materials across a membrane that does not require energy from the cell
phospholipid bilayer the double layer of phospholipids that makes up the membranes of a cell
diffusion process in which atoms and molecules move from an area where they are more concentrated to an area where they are less concentrated
semipermeable permeable to some molecules, but not to others
phospholipids the type of molecule that makes up the bulk of the cell membrane
cholesterol helps hold the phospholipids together in the membrane
fluid mosaic model a description of the cell membrane
protein channels Help molecules get into and out of the cells



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