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the act of dispersing or diffusing something

facilitated diffusion

movement of specific molecules across cell membranes through protein channels


Water channel proteins that allow water to pass right through them


diffusion of water through a selectively permeable membrane


equal concentration


when comparing two solutions, the solution with the greater concentration of solutes


(of a solution) having a lower osmotic pressure than a comparison solution

osmotic pressure

pressure that must be applied to prevent osmotic movement across a selectively permeable membrane

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