the passage of water from a region where it has a higher water potential to region where it has a lower water potential through a seleectively permeable membrane
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Which 2 are selectively permeable
CSM & plasma membrane
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What is 'selectively permeable'
they are permeable to water molecules and a few other small molecules (not large)
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Define a solute
Any substance that has been dissolved in a solvent
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What forms a solution
Solute and solvent together
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What is water potential measured in
kPa
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Define water potential
Pressure created by water molecules
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What is the water potential of 'PURE WATER'
0
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What lowers the water potential
adding soluted to pure water
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What must the water potential ALWAYS be in a solution
x
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The more concentrated a solution, the water potential is....
LOWER __ (more negative number)
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A water potential of -20kPA and -30kPa, whats the direction of net movement
High water potential (less negative: -20kPa) to a region of lower water potential (more negative : -30kPa)
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What does it mean if there is no net gain or no loss/gain of water
water potential inside the cell/tissue MUST be the same of the external solution [equilibrium has been established]
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How do the solution move
At a random motion due to KINETIC ENERGY
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What DON'T selectively permeable plasma membrane alllow
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