osmosis - the diffusion of water through a membrane, equilibrium - the state a substance is in when the concentration is the same on both sides of a cell membrane, transport proteins - proteins that assist with the transport of molecules through a cell menbrane, semipermeable - allows only certain substances to enter or leave the cell, facilitated diffusion - when molecules pass through a cell membrane using transport proteins, passive transport - the movement of substances through a cell membrane without using the cell's energy, simple diffusion - the movement of substances from an area of higher concentration to an area of lower concentration, passive - type of transport that involves substances moving from areas of higher to areas of lower concentration,

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