| Term | Definition |
|---|
| Passive Transport | Movement across the cell membrane that does not require energy from the cell |
| Concentration Gradient | A difference in the concentration of a substance across a space, the gradient to which molecules move down (high to low) during diffusion. |
| Equilibrium | A condition in which the concentration of a substance is equal throughout a space |
| Diffusion | The movement of a substance from an area of high concentration to an area of lower concentration caused by the random motion of particles of the substances |
| Osmosis | The diffusion of water through a selectively permeable membrane |
| Permeable | allowing (especially liquids) to pass or diffuse through |
| Hypertonic Solution | A solution that causes a cell to shrink because of osmosis |
| Hypotonic Solution | A solution that causes a cell to swell because of osmosis, a solution in which the concentration of solutes is less than that of the cell that resides in the solution |
| Isotonic Solution | A solution that produces no change in cell volume because of osmosis , a solution having the same osmotic pressure as blood |
| Ion Channel | A transport protein with a polar pore through which ions can pass |
| Carrier Proteins | Transport protein in cells that can bind to a specific substance on one side of the cell membrane, carry the substance across the cell membrane and release it on the other side |
| Facilitated Diffusion | A type of passive transport which moves substances down their concentration gradient without using the cell's energy |
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