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12 Cards in this Set

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