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8 Cards in this Set
- Front
- Back
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Active Transport
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Pumping a specific solute across a cell membrane, through the interior of a transport protein. Requires an energy boost, as from ATP.
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Passive Transport
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Process by which a transport protein that spans a cell membrance passively permits a solute to diffuse through its interior
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Concentraion Gradient
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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.
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Diffustion
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Net movement of like molecule down a concentration gradient.
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Osmosis
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Diffusion of water molecules in response to a water concentartion gradient between two regions that are separated by a selectively permeable membrane.
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Hypertonic
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Water diffuses out of cells, shrink
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Hypotonic
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Water diffuses into red blood cells, which swell up
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Isotonic
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No change
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