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process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated
result of diffusion where there is continuous movement of particles but no overall change in concentration
pathway provided by transport proteins that helps certain molecules pass through a membrane
the movement of substances across a cell membrane without the use of energy by the cell
process in which extensions of cytoplasm surround and engulf large particles and take them into the cell
selectively permeable membrane
membrane that allows some substances to pass more easily than others and blocks the passage of some substances altogether
mixture of two or more substances in which the molecules of the substances are evenly distributed
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