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Chapter 4
Cells and Their Environment
Term | Definition |
---|---|
passive transport | movement across the membrane that requires NO energy |
concentration gradient | a difference in the concentration of a substance |
equilibrium | concentration is equal throughout a space |
diffusion | the movement of a substance from an area of high concentration to an area of low concentration |
osmosis | the movement of water |
hypertonic solution | water moves out, cells shrink |
hypotonic solution | water moves in, cells swell |
isotonic solution | no water movement because it is equal |
facilitated diffusion | passive transport with help from carrier proteins |
carrier protein | helps with facilitated diffusion |
active transport | movement across the membrane the requires energy, low concentration to high concentration |
endocytosis | movement of a substance into a cell |
exocytosis | movement of a substance out of a cell |