| A | B |
|---|
| Active Transport | The movement of particles from an area of low concentration to an area of high concentration that uses energy provided by ATP or a difference in electrical charges across a cell membrane. |
| Carrier (Transport) Proteins | Proteins embedded in the plasma membrane involved in the movement of ions |
| Endocytosis | A process in which a cell engulfs extracellular material through an inward folding of its plasma membrane. |
| Exocytosis | A process in which a cell releases substances to the extracellular environment by fusing a vesicular membrane with the plasma membrane |
| Facilitated Diffusion | A process in which substances are transported across a plasma membrane with the concentration gradient with the aid of carrier (transport) proteins; does not require the use of energy. |
| Homeostasis | The regulatory process in which an organism regulates its internal environment. |
| Homeostatic Mechanism | A regulatory mechanism that contributes to maintaining a state of equilibrium (e.g. |
| Impermeable | Not permitting passage of a substance or substances. |
| Osmosis | The movement of water or another solvent through permeable membranes from an area of higher water concentration (dilute) to an area of lower water concentration (concentrated). |
| Passive Transport | The transportation of materials across a plasma membrane without using energy. |
| Pumps (Ion or Molecular) | Any of several molecular mechanisms in which ions or molecules are transported across a cellular membrane requiring the use of an energy source (e.g. |
