| Term | Definition |
|---|
| diffusion | movement of molecules across a membrane from high to low concentration without energy |
| concentration gradient | difference in concentration of a substance on two sides of a membrane |
| osmosis | movement of water across a membrane from high to low concentration without energy |
| semi-permeable | characteristic of a cell membrane which allows some molecules to pass through but not others |
| impermeable | molecules are not able to pass through the membrane |
| facilitated diffusion | movement of molecules through protein channels in the membrane from high to low concentration |
| active transport | movement of molecules through protein channels in the membrane from low to high concentration requiring energy (ATP) |
| passive transport | movement of molecules across a membrane from high to low concentration without energy, ex. diffusion, osmosis, facilitated diffusion |
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