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chapter 5 section 1

passive transport

TermDefinition
passive transport the cross of the cell membrane without any input of energy by the cell
diffusion the movement of molecules from an area of higher concentration to an are of lower concentration
concentration gradient the difference in the concentration of the molecules across a distance
equilibrium the concentration of molecules will be the same throughout the space the molecules occupy
osmosis the process by which water molecules diffuse across a cell membrane from an area of higher concentration to an area of lower concentration
hypertonic when the concentration of solute molecules outside the cell is lower than the concentration in the cytosol
hypotonic when the concentration of solute molecules outside the cell is higher than the concentration in the cytosol
isotonic when the concentration of solutes outside and inside the cell are equal
contractile vacuole organelles that remove water. they collect the excess water and ten contract, pumping the water out of the cell
turgor pressure the pressure that water molecules exert against the cell wall
plasmolysis in a hypertonic environment, water leaves he cell through osmosis. the cell shrinks away from the cell walls and the turgor pressure is lost. this is also the main reason plants wilt of they don't get enough water.
cytolysis the bursting if cells
facilitated diffusion the process that is used for molecules that cannot readily diffuse through cell membranes, even when there is a concentration gradient across the cell membrane
carrier protein specific proteins in the membrane
ion channel membrane proteins that transport ions from higher to lower concentrations
Created by: campbellm19