- structure: the way in which parts are put together or arranged to make a whole.
- function: what someone or something does. What something is used for.
- diffusion: the process by which molecules move from an area of higher concentration to an area of lower concentration.
- osmosis: the diffusion of water molecules through a selectively permeable membrane.
- membrane: a structure that controls which substances leave the cell.
- selectively permeable: a property of cell membranes that allows some substances to pass through, while others can’t.
- molecule: any very small particle of a substance.
- passive transport: the movement of materials through a cell membrane without using energy.
- active transport: the movement of materials through a cell membrane using cellular energy.
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