| A | B |
|---|
| selective permeability | Allows some substances to pass through but not others |
| phospholipid | a type of lipid molecule consisting of a polar phosphate head and two nonpolar fatty acid tails. |
| fluid mossaic model | description of the plasma membrane with fluid like qualities due to side to side movement of phospholipid molecules and proteins embedded in lipid bilayer |
| diffusion | Movement of substances from high to low concentration |
| dynamic equilibrium | Substances are moving equall in both directions. No net change in concentration. |
| osmosis | Movement of water from a high to low concentration through a selectively permeable membrane. |
| isotonic solution | Solute concentation is the same in the environment as in the cell. |
| hypotonic solution | The concentration of solute is less in the environment than in the cell. |
| hypertonic solution | The concentration of solute is higher in the environment than in the cell. |
| facilitated diffusion | Movement of substances from high to low concentration with help from membrane proteins. |
| passive transport | Movement of substances from high to low concentration, dosn't require energy and includes facilitated diffusion, osmosis, and simple diffusion. |
