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12 Cards in this Set
- Front
- Back
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OSMOSIS
definition |
The diffusion of a solvent, such as water, through a selectively permeable membrane
osmosis=pushing |
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When does osmosis occur?
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whenever the water concentration differs on the two sides of a membrane.
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The extent to which water's concentration is decreased by solutes depends on?
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number of solute particles not type of solute particles because 1 molecule or ion of solute displaces 1 water molecule.
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OSMOLARITY
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the total concentration of all solute particles in a solution
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HYDROSTATIC PRESSURE
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the back of pressure exerted by water against the membrane
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OSMOTIC PRESSURE
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the cell's tendency to resis further water entry.
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TONICITY
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the ability of a solution to change the shape or tone of cells by altering their internal water volume
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ISOTONIC
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cells that have the same tonicity
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HYPERTONIC
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Solutions with a higher concentration of nonpenetrating solutes than is seen in the cell
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HYPOTONIC
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Solutions that are more dilute (containing a lower concentration of nonpenetrating solutes) than cells.
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FILTRATION
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the process that forces water and solutes through a membrane or capillary wall by fluid.
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ACTIVE TRANSPORT
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Requires proteins that combine specifically and reversibly with the transported substances
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