Ch 3 Cells
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Created by:
emmasma Plus on October 19, 2009
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20 terms
Terms | Definitions |
|---|---|
 PHAGOCYTOSIS | the process by which a cell engulfs foreign substances or other cells |
| ENDOCYTOSIS | the process of taking substances into a cell by sorounding it with the cell membrane |
| ACTIVE TRANSPORT | the movement of particles through proteins in the cell membrane against the direction of diffusion; requires cells to use energy |
| DIFFUSION | process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated |
| OSMOSIS | the diffusion of water through a cell membrane |
| ISOTONIC | having a solute concentration equal to that of another solution |
| HYPOTONIC | having a lower concentration of solute than another solution |
| HYPERTONIC | having a higher concentration of solute than another solution |
| EXOCYTOSIS | cell moves large molecules out through the cell membrane |
| FACILITATED DIFFUSION | movement of specific molecules across cell membranes through protein channels |
| OPERON | turns DNA on and off |
| INTERPHASE | period of the cell cycle between cell divisions |
| MITOSIS | cell division |
| ATP | main energy source for cells |
| ADP | ATP minus one phosphate molecule |
| INTERSTICES | small spaces between cells |
| ANCHORING JUNCTIONS | junctions that hold cells together loosely |
| TIGHT JUNCTIONS | bind cells very tightly together, forming a a leakproof sheet |
| COMMUNICATING JUNCTIONS | junctions that allow material to pass from one cell to another cell |
| CONTACT INHIBITION | stops additional cell growth when cells become crowded |
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