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Biology - Day 30.docx

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Lakehead University
BIOL 1130

Biology – Day 30 Friday November 23, 2012 Osmosis – movement of H O acr2ss a semi-permeable membrane - H 2 moves from a region of higher come (H O) to 2 lower concentration (of H O) 2 Cell Structure a. Higher soluble concentration inside a cell vs. outside (hypertonic concentration). H 2 moves into a cell because H O i2 higher in concentration outside of the cell. b. Lower solution concentration inside cell vs. outside (hypotonic concentration) H 2 moves out of the cell because H O is2in higher concentration inside the cell. c. Equal concentration of solute inside vs. outside (isotonic) - No net movement of H O 2 Osmotic Potential - Can quantify it by applying enough pressure to reverse the flow of H O into2the cell. - Osmotic Potential will have: o A) Value of either – or O o A more negative Osmotic Potential has a greater potential to take up H O. 2 Pressure Potential - Pressure exerted in cytoplasmic membrane against the cell wall  Turgor Pressure - Turgor Pressure is high when the cell membrane pressed against the cell wall - - If the cell membrane is not pressed against the cell wall – plasmolysis occurs. Water Potential Wp = Op + Pp (Water Potential = Osmotic Potential + Pressure Pote
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