| fluid mosaic model | | process by which the cell expels large particles |
| phospholipid | | a solution in which the concentration of dissolved substances is greater than the concentration of dissolved substances inside the cell |
| hypertonic solution | | passive transport of materials across the plasma membrane by way of transport proteins |
| diffusion | | diffusion of water molecules through a selectively permeable membrane |
| exocytosis | | property of the plasma membrane wherein many similar molecules are free to move sideways within their lipid bilayer |
| endocytosis | | proteins embedded in the lipid bilaryer of the plasma membrane to move ions and molecules across the membrane |
| transport protein | | a solution in which the concentration of dissolved substances is less than the concentration of dissoved substances inside the cell |
| plasmolysis | | membrane lipid having an organic section attached to a phosphate group; a polar "head" attached to fatty acid "tails" |
| active transport | | process by which large particles enter the cell |
| isotonic solution | | diffusion of substances across a selectively permeable membrane |
| faciliated diffusion | | a solution in which the concentration of dissolved substances is the same as the concentration of dissolved substances inside the cell |
| osmosis | | property of a plasma membrane that maintains the cell's homeostasis by taking in needed substances, eliminating wastes, and preventing harmful substances from entering |
| hypotonic solution | | process requiring energy by which cells move materials against a concentration gradient |
| dynamic equilibrium | | net, randome movement of particles form an area of higher concentration to an area of lower concentration |
| turgor pressure | | process resulting from a drop in turgor pressure as a result of water loss in a cell; the cell shrinks away from the cell wall |
| passive transport | | condition of continuous movement but no overall change |
| contractile vacuole | | internal pressure of a cell due to water held there by osmotic pressure |
| selective permeability | | organelle of some protists that collects excess water from then cell, then contracts and expels the water through a plasma membrane pore |
