Science Unit 2

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STUDY
PLAY
selectively permeable
cell membrane allows sine things to enter and leave the cell
passive transport
movement of substances without the use of energy
diffusion
movement of molecules from many to fewer
equilibrium
molecules are evenly spread out
osmosis
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
endocytosis
large molecules are taken in to the cell by a pinching in of the cell membrane
exocytosis
large molecules are released from the cell and placed in a vacuole, releases its contents