Osmosis

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Water Potential
The tendency for water to move (kPa). Water moves from an area of high water potential to an area of low water potential
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Solute Potential
The measure of how easily water molecules move out of a solution. Solutes reduce the water potential so a high solute concentration = a more negative solute potential
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Pressure Potential
Only occurs in cells with cell walls. Is the measure of the pressure exerted by water entering the cell
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Hypotonic (plants)
When the water potential outside the cell is higher than inside causing water to flow in. Cells become turgid, providing support
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Hypertonic (plants)
When the water potential outside the cell is lower than inside causing water to flow out. Cells become flaccid or plasmolysed
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Plasmolysis
The retraction of the cytoplasm and cell membrane from the cell wall of cells in a hypertonic solution
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Isotonic
When the water potential is the same inside and outside the cell. There's no movement of water.
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Incipient Plasmolysis
Where the cell membrane and cytoplasm are partially retracted from the cell wall. Pressure potential=0
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Hypotonic (animal)
Water potential outside the cell is higher than inside causing water to move in. Cells burst (haemolysis)
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Hypertonic (animal)
Water potential outside the cell is lower than inside the cell causing water to flow out. Cells shrink (crenation)
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Other cards in this set

Card 2

Front

The measure of how easily water molecules move out of a solution. Solutes reduce the water potential so a high solute concentration = a more negative solute potential

Back

Solute Potential

Card 3

Front

Only occurs in cells with cell walls. Is the measure of the pressure exerted by water entering the cell

Back

Preview of the back of card 3

Card 4

Front

When the water potential outside the cell is higher than inside causing water to flow in. Cells become turgid, providing support

Back

Preview of the back of card 4

Card 5

Front

When the water potential outside the cell is lower than inside causing water to flow out. Cells become flaccid or plasmolysed

Back

Preview of the back of card 5
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