| Term | Definition |
|---|
| homeostasis | a balance maintained in a living thing |
| diffusion | movement of molecules from a high to a low concentration by random molecular motion |
| concentration gradient | difference in concentrations of a substance between two places |
| random molecular motion, kinetic energy | cause of diffusion |
| equilibrium | final balance between two concentrations |
| osmosis | diffusion of water through a cell membrane |
| hypotonic | a solution that has more water, and less solute, than the cell |
| hypertonic | a solution that has less water, and more solute, than the cell |
| isotonic | a solution that has the same levels of water and solutes as the cell |
| out of the cell | what direction water moves overall if a cell is placed in a hypertonic solution |
| into the cell | what direction water moves overall if a cell is placed in a hypotonic solution |
| contractile vacuole | special cell part that some protists such as Paramecium have, that removes excess water from their cell |
| plamolysis | loss of turgor pressure and wilting of cells |
| turgor pressure | pressure of water molecules inside a plant cell, pushing against the cell wall |
| cytolysis | bursting of cells in a hypotonic solution |
| facilitated diffusion | type of movement through a cell membrane that is assisted by carrier proteins |
| carrier proteins | proteins in a cell membrane that help facilitated diffusion to occur |
| active transport | transport through a cell membrane that requires ATP |
| active transport | transport through a cell membrane from low to high concentration |
| passive transport | tranport through a cell membrane that does not require ATP |
| sodium-potassium pump | example of active transport important in nerve cells and elsewhere |
| endocytosis and exocytosis | two ways that large molecules are transported in or out of a cell |
| endocytosis | ingestion of large molecules, particles, and fluid |
| pinocytosis | type of endocytosis that takes in a fluid or solutes |
| phagocytosis | type of endocytosis that takes in particles or whole cells |
| exocytosis | cell mechanism to release large materials from a cell |
| exocytosis | reverse of endocytosis |
| phagocyte | type of cell that takes in and digests other cells |
| concentration | the total amount of a substance in an particular spot (example, how strong some salt water is) |
Combine with other sets
Share on Facebook
Share on MySpace