The natural phenomenon caused by the tendency of small particles to spread out evenly within any given space.

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Movement of particles through the phospholipid bi-layer or through channels from an area of high concentration to low concentration.

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Diffusion of water through a selectively permeable membrane in the presence of at least one impermeant solute.

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Diffusion of particles through the membrane by means of carrier molecules. Also called carrier-mediated passive transport.

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Facilitated diffusion through the use of a protein channel. 

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The transport of substances against their concentration gradient by the use of active transport pumps.

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Membrane receptor molecules recognize sunstances to be brought into the cell.

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"Condition of cell- eating"; large particles are engulfed by the plasma membrane and enter the cell in vesicles. This is another type of endocytosis.

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"Condition of cell-drinking"; fluid and substances dissolved in it enter the cell. This is a type of endocytosis.

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Movement of proteins or other cell products out of the cell by fusing a secretory vesicle with the plasma membrane. 

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Refers to a carrier-mediated proccess in which cellular energy is used to move molecules from low concentration to high concentration.

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The movement of molecules against their concentration gradient without the use of energy.

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