Diffusion definition: net movement of particles from an area where there are many particles of a substance to an area where there are fewer particles of the substance
Exocytosis
Osmosis definition: diffusion of water across a selectively permeable membrane
Exocytosis
Definition: movement of substances across the plasma membrane against a concentration gradient requires energy
Active Transport
Endocytosis definition: the process by which a cell surrounds a substance in the outside environment, enclosing the substance in a portion of the plasma membrane
Exocytosis definition: the secretion of materials at the plasma membrane
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