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Osmosis. Transport mechanisms Passive transport (doesnt require energy) Diffusion Facilitated diffusion Osmosis Filtration Active transport (uses energy.

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Presentation on theme: "Osmosis. Transport mechanisms Passive transport (doesnt require energy) Diffusion Facilitated diffusion Osmosis Filtration Active transport (uses energy."— Presentation transcript:

1 Osmosis

2 Transport mechanisms Passive transport (doesnt require energy) Diffusion Facilitated diffusion Osmosis Filtration Active transport (uses energy from ATP) Active transport Bulk transport } Movement down a concentration gradient

3 3. OsmosisDiffusion of water molecules through a selectively permeable membrane, from an area of high water potential to an area of low water potential NB: Water potential gradient is opposite to solute concentration gradient. High water potential = low solute concentration

4 Concentration Gradient Water Potential Gradient

5 Membrane is impermeable to large sugar molecules but permeable to small water molecules

6 Selectively permeable membrane H2OH2O

7 OSMOSIS Why is OSMOSIS important for living organisms? Osmo-regulationOsmo-regulation - maintaining the right levels of water in cells is vital for life. HOMEOSTASIS HOMEOSTASIS – maintain balance / equilibrium Water moves between cellsWater moves between cells in a multi-cellular organism Water balance COPY

8 Passive transport c&feature=related (osmosis, 1 min)http://www.youtube.com/watch?v=sdiJtDRJQE c&feature=related MyY (passive transport, 5 min)http://www.youtube.com/watch?v=JShwXBWG MyY

9 Transport mechanisms Passive transport (doesnt require energy) Diffusion Facilitated diffusion Osmosis Filtration Active transport (uses energy from ATP) Active transport Bulk transport } Movement down a concentration gradient

10 2. Active transport Uses chemical energy from ATP Move molecules against the concentration gradient (low conc. high conc.)

11

12 Tonicity is a relative term Hypotonic SolutionHypotonic Solution - lower concentration than another solution Hypertonic SolutionHypertonic Solution - higher concentration than another solution Isotonic SolutionIsotonic Solution - both solutions have same concentration

13 Shriveled TurgidFlaccid Plasmolysed Normal Lysed HYPOTONICISOTONIC HYPERTONIC ANIMAL CELL PLANT CELL

14 ISOTONIC HYPERTONICHYPOTONIC NORMAL EXPANDED SHRIVELED


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