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20 Cards in this Set
- Front
- Back
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diffusion
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movemnt of molecules from an area of high concentration to an area of low concentration
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concentration gradient
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difference in the concentration of molecules across a space
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equilibrium
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same throughout a space
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osmosis
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doesnt require energy;
h20 molecules difuse across a cell membarane from an area of high concentration to an area of lower concentration |
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hypotonic
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swell; water into cell
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hypertonic
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shrink; water diffuses out of the cell
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isotonic
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normal; diffses into & out of cell
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contractile vaculoes
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collet excess water and contract pumping the water out of the cell
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turgor pressure
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pressure tha twater molecules exert against the cell wall
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plasmolysis
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water leaves cells through osmosis. cells shirnk away from th ecell walls and turgor pressure is lost
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cytolosis
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bursting of cells
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facilitated diffusion
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used for molecules that cant diffuse rapidly through a cell membrane
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carrier proteins
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to assist move molecules across a cell membrane
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ion channels
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diffusion; some are always open, other gates open and close,
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active transport
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requires a cell to expand energy
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sodium potassium pump
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example of active transport in animal cells involving a carrier protein
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endocytosis
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process by which cells ingest external fluid, macromolecules and large particles including cells
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phagocytes
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fuse virus and bacteria
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pinocytosis
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involves transport of solutes or fluids
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exocytosis
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vesicles fuse with cell membrane then release the contents into the cells
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