| A | B |
|---|
| facilitated diffusion | passive transport with help from transport proteins |
| diffusion | any particles going from high to low concentration |
| cell membrane | controls what enters or exits the cell |
| osmosis | water diffusing in or out of the cell |
| concentraton gradient | natural flow from high to low |
| isotonic | same water concentration inside and outside of the cell |
| hypotonic | low water concentration inside of the cell |
| hypertonic | low water concentration outside the cell |
| passive transport | transport that does not require energy |
| transport protein | assist molecules through the cell membrane; act as tunnels or passages |
| active transport | uses energy to move materials against the concentration gradient |
| endocytosis | a cell surrounds and takes in large material from the environment |
| exocytosis | large materials are expelled from the cell |
| selectively permeable | the cell chooses what comes in and out |
