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Chapter 4

Cells and Their Environment

TermDefinition
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
Created by: jyoung271