the movement of particles from regions of higher density to regions of lower density

the diffusion of water through a semipermeable membrane

the movement of substances across a cell membrane without the use of energy by the cell

the movement of substances across the cell membrane that requires the cell to use energy

the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell

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The Cell in Action

Robert Prince

Term	Definition
Diffusion	the movement of particles from regions of higher density to regions of lower density
Osmosis	the diffusion of water through a semipermeable membrane
Passive Transport	the movement of substances across a cell membrane without the use of energy by the cell
Active Transport	the movement of substances across the cell membrane that requires the cell to use energy
Endocytosis	the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell