Describe the transport mechanisms across the membrane 0.0 / 5 ? BiologyCellular processes and structureASAQA Created by: RosieCreated on: 05-05-14 14:59 Diffusion Movement of molecules/ions from high to low concentration down a concentration gradient, across a membrane 1 of 5 Facilitated diffusion movement of molecules /ions from high to low concetration down a gradient, through protein channels 2 of 5 Osmosis movement of water from a region of high water potential down a water potential gradient. 3 of 5 Active transport movement of molecules/ions from low to high concentration against a concentration gradient through protein carriers: requires energy from ATP 4 of 5 Cytosis (Endo & Exo) engulfing by membrane to form a vesicle (endocytosis) or vesicle merging with membrane (exocytosis) 5 of 5
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