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Cell Function Vocab Sub

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Cell Function Vocab Sub

  1. 1. Cell Function Vocab 3/30/09
  2. 2. VOCABULARY <ul><li>concentration gradient – concentration at various points between the highest and lowest concentrations </li></ul><ul><li>diffusion – movement of molecules from high to low concentration </li></ul><ul><li>osmosis – movement of water through a membrane </li></ul><ul><li>endocytosis – movement of substances INTO a cell </li></ul><ul><li>exocytosis – movement of substances OUT of a cell </li></ul><ul><li>plasmolysis – condition where a cell collapses because water is diffusing out </li></ul><ul><li>cytolysis – condition where a cell bursts because of water diffusing in (occurs in animal cells) </li></ul><ul><li>turgor pressure – condition where water pressure in the vacuole of a plant cell pushes out against the cell walls </li></ul>
  3. 3. VOCABULARY <ul><li>tonicity – comparison of the relative concentrations of solutions </li></ul><ul><li>hypertonic – a solution that has more solutes </li></ul><ul><li>hypotonic – a solution that has less solutes </li></ul><ul><li>isotonic – solutions that have equal solutes (homeostasis, balance, equilibrium) </li></ul><ul><li>permeability – ability of a membrane to allow molecules to pass through </li></ul><ul><li>selectively ( semi ) permeable – only some molecules can pass through </li></ul><ul><li>permeable – all molecules can pass through </li></ul><ul><li>impermeable – no molecules can pass through </li></ul>

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