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14 Cards in this Set

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Passive Transport
The movement of substances across the membrane.
Diffusion
The movement of molecules from an area of higher concentration to an area of lower concentration
Concentration Gradient
The difference in the concentration of molecules across a space.
Equilibrium
When the concentration of the molecules of a substance is the same throughout a space.
Hypotonic
Describing a solution whose solute concentration is lower than that inside a cell.
Hypertonic
Describing a solution whose solute concentration is higher than that inside a cell.
Isotonic
Describing a solution whose solute concentration equals that inside a cell.
Contractile Vacuole
An organelle in protists that expels water.
Turgor Pressure
Water pressure within a plant cell.
Plasmoysis
The shrinking or wilting of a walled cell in a hypertonic environment.
Cytolysis
The bursting of a cell.
Facilitated Diffusion
A process in which substances move down their concentration gradient across the cell membrane with the assistance of carrier proteins.
Carrier Proteins
A protein that transports specific substances across a biological membrane.
Ion Channels
A membrane protein that membrane through which an ion can diffuse.