Osmosis
- Created by: Sophie Gibbons
- Created on: 06-01-13 14:28
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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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