| A | B |
|---|
| diffusion | movement of particles from area of high concentration to low concentration |
| osmosis | diffusion of water across a selectively permeable membrane |
| selectively permeable | allows some particles to pass through, but not others |
| contractile vacuole | a structure found in some cells that pumps out excess water |
| lipid bilayer | describes the structure of the cell membrane |
| transport protein | a molecule imbedded in the cell menbrane that allows for the transport of certain molecules in and out of the cell |
| active transport | low to high; takes energy |
| passive transport | high to low; requires no energy |
