net movement of water molecules across a partially permeable membrane from an area of high concentration to an area of low concentration
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solute
substance dissolved in a solvent to form a solution
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Water Potential
pressure exerted by water molecules when they collide with a membrane/container
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water potential of pure water?
0kPa (highest water potential value possible)
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Water potential of solutions?
all solutions will have negative water potential-the more concentrated the solution,the more negative water potential
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Hydrostatic Pressure?
pressure exerted by water when it diffuses into a closed system
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Cytolysis
cell bursts due to excessive hydrostatic pressure exerted on its plasma membrane
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Crenation
the cell shrinks due to too much water leaving cell by osmosis
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how do animals prevent crenation/cyotlysis?
have control mechanisms to ensure their cells are continuously surrounded by aqueous solutions that are isotonic(equal water potential) to the cells e.g blood plasma
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Turgid
cell swells cos water enters cell by osmosis-the increased hydrostatic pressure pushes the membrane against cell wall creating turgor pressure
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Plasmolysis
water leaves cell by osmosis-cell membrane+contents to shrink away from cell wall
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Other cards in this set
Card 2
Front
solute
Back
substance dissolved in a solvent to form a solution
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