| Term | Definition |
| Solute | substance that dissolves in a solution |
| Hypotonic | having a lower concentration than what you are comparing it to |
| isotonic | having the same or equal concentration |
| hypertonic | more solute dissolved than what you are comparing it to |
| osmosis | the process of water going out of a cell membrane from high pressure to low pressure |
| diffusion | moving from high to low concentration |
| Pump needs | energy to work |
| active transport | using energy to move something from low concentration to high concentration through a channel in the membrane |
| Facilitated diffusion | movement of something through a channel in a membrane from high to low concentration without using energy |