Osmosis

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  • Osmosis
    • The net movement of water molecules from a region of high water potential to a region of low water potential through a partially permeable membrane.
    • Water potentiall
      • The  highest value of water potential is 0.
      • The more negative the value the lower the water potential.
      • Measured in kilopascals (kPa)
      • Always a NEGATIVE value.
    • Solutions
      • Solution - solvent and solution together.
      • Adding a solute will LOWER water potential.
      • Hypotonic - higher water potential
      • Hypertonic - lower water potential
      • Solute - a substance which is dissolved in a solvent.
      • Isotonic - same water potential.
    • Osmosis in animal cells
      • Hypotonic - water moves into the cell by osmosis, swells and bursts, lysis, products are released.
      • Hypertonic - water leaves cell by osmosis, cell shrinks.
    • Osmosis  in plant cells
      • Hypotonic - water enters the cell, swells, becomes turgid, protoplast pushed against cell wall .
      • Hypertonic - water leaves the cell, shrinks, protoplast pulls away from cell wall, plasmolysis.
  • Hypotonic - higher water potential

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