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Cell Transport

AB
diffusionmovement from high to low concentration
facilitated diffusionneeds the help of a protein but no energy used
concentration gradientthe difference in concentration of a substance
transport proteinembedded in lipid bilayer to help substances cross the membranecross
equilibriumequal concentration of a substance
ion channelprotein through which ions can pass
osmosisthe diffusion of water
hypotonicmore free water outside of the cell
active transportrequires energy
isotonicequal concentration of free water in and out of cell
exocytosisvery large substance leaves the cell
hypertonica cell in salt water
endocytosiswhen a large molecule enters the cell by a vesicle
phospholipidsallows polar molecules to cross the membrane
ATPneeded for active transport


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