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8 Cards in this Set

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Active Transport
Pumping a specific solute across a cell membrane, through the interior of a transport protein. Requires an energy boost, as from ATP.
Passive Transport
Process by which a transport protein that spans a cell membrance passively permits a solute to diffuse through its interior
Concentraion Gradient
Between two adjoining regions, a difference in the number of molecules of a substance. All molecules are in constant motion. As they collide, they careen outward to an adjoining region where they are less concentrated. Barring other forces, all substances diffuse down such a gradient.
Diffustion
Net movement of like molecule down a concentration gradient.
Osmosis
Diffusion of water molecules in response to a water concentartion gradient between two regions that are separated by a selectively permeable membrane.
Hypertonic
Water diffuses out of cells, shrink
Hypotonic
Water diffuses into red blood cells, which swell up
Isotonic
No change