Type of transport that does not require energy to occur

Concentration gradient

A region of space over which the concentration of a substance changes

The quality of a membrane that allows substances to pass through it

The state at which a substance is equally distributed throughout a space

substances move from an area of high concentration to an area of low concentration, until the concentration becomes equal throughout a space.

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Passive transport

only on passive transpor

Term	Definition
Passive transport	Type of transport that does not require energy to occur
Concentration gradient	A region of space over which the concentration of a substance changes
Permeability	The quality of a membrane that allows substances to pass through it
Equilibrium	The state at which a substance is equally distributed throughout a space
Diffusion	substances move from an area of high concentration to an area of low concentration, until the concentration becomes equal throughout a space.