| A | B |
|---|
| homeostasis | maintaining a stable internal environment |
| passive transport | transport not requiring energy |
| diffusion | the movement of molecules down their concentration gradient |
| osmosis | the diffusion of water across the cell membrane |
| facilitated diffusion | requires carrier proteins but no energy |
| active transport | requires energy from ATP |
| sodium-potassium pump | moves Na out and K in |
| endocytosis | active transport of substances into a cell |
| exocytosis | active transport of substances out of a cell |
| hypertonic | a high solute concentration |
| hypotonic | a low solute concentration |
| isotonic | when the solute concentration is the same |
| equilibrium | when molecules are evenly distributed across an area |
| concentration gradient | the different in the concentration of molecules across a space |
