Osmosis

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  • Created by: Davyz
  • Created on: 18-03-14 16:32
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  • Osmosis
    • Water Potential
      • High WP = Less Negative
        • Water moves down WP gradient
      • Low WP = More Negative
        • Water moves down WP gradient
      • WP refers to the amount of solute in the water
    • Movement through plants
      • Enters roots from soil, down WP gradient
        • Moves through the roots
          • Apoplastic pathway - Water is drawn into endodermal cells and the waters cohesive properties allows it to be pulled through the cellulose cell-wall
          • Symplastic pathway - Water moves through the cells of the cortex via the process of osmosis. The water diffuses from the cytoplasm of one cell into the cytoplasm of another
            • Both pathways lead to the xylem where the water is distributed to the rest of the plant.
              • Apoplastic pathway - Water is drawn into endodermal cells and the waters cohesive properties allows it to be pulled through the cellulose cell-wall
    • Haemoglobin
      • Blood is always under the influence of osmosis
      • If the blood is in a hypertonic solution then the red blood cells will gain water
        • The RBC begins to swell and will eventually burst
          • This will cause the haemoglobin to be released affecting their ability to transport O2
    • Hypotonic
      • The WP is higher in the solution + outside the cell than in the cell
    • Hypertonic
      • The WP is Lower in the solution + outside the cell than in the cell

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