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unit 3 science vocab
quiz 09/12/23
Term | Definition |
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Cell membrane | A thin, flexible barrier that surrounds a cell and controls which substances pass into and out of a cell |
Selectively Permeable | A property of cell membranes that allows some substances to pass across it, while others don't |
Passive Transport | The movement of dissolved materials across a cell membrane WITHOUT using the cell's energy |
Active Transport | The movement of materials across a cell membrane USING cellular energy |
Diffusion | The process by which molecules move from an area of higher concentration to an area of lower concentration or the other way around |
Osmosis | The diffusion of water molecule across a selectively permeable membrane |
Endocytosis | The process by which the cell membrane takes particles into the cell by changing shape and engulfing the particles |
Exocytosis | The process by which the vacuole surrounding particles fuses with the cell membrane, forcing the contents out of the cell |
Homeostasis | The condition in which an organism's internal environment is kept stable in spite of changes in the external environment |
Maintain | To keep in an existing state |