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15 Cards in this Set

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passive transport
the movement of substances across the cell membrane without the use of energy by the cell
diffusion
the movement of particles from regions of higher density to refions of lower density
concentration gradient
a difference in the concebtration of a substance across a distance
equilibrium
i biology a state that exists when the concentration of a substance is the smae throughout a space
osmosis
the diffision of water or another solcvent froma more diflute soluriom of a solute to amore concentrated solution of the solute through a membrane that is permeable to the solvent
hypotonic
describes a solution whose solute concentration is lower than the solute concentrarion inside a cell
hypertonic
describes a solurion whos solute concentrartion is higher than the soure concentration inside a cell
isotonic
describes a solution whose solulte concentration is equal to the solute concentration inside the cell
contractile vacuole
in protists an organelle that accumulates water and then releases it periodicaly to maintain osmotic pressure
turgor pressure
the pressure that is exerted on the inside od cell walls and that is caused by the movement of water into the cell
plasmolysis
the contraction of shrinking of the cell membvrane of a plant cell in a hypertonic solution in response to the loss of water by osmosis
cytolysis
the bursting of a cell
facilitated diffusion
the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
carrier protein
a protein that transports substances across a cell membrane
ion channel
a complex of protein molecules in a cell membrane that form a pore through which ions can pass