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selectively permeable

cell membrane allows sine things to enter and leave the cell

passive transport

movement of substances without the use of energy


movement of molecules from many to fewer


molecules are evenly spread out


diffusion of water through a cell membrane from high to low

facilitated diffusion

large molecules can diffuse through the membrane with the help of transport proteins

active transport

when energy is needed to move materials though the cell membrane


large molecules are taken in to the cell by a pinching in of the cell membrane


large molecules are released from the cell and placed in a vacuole, releases its contents

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