Diffusion and Osmosis - University of California,...
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![Page 1: Diffusion and Osmosis - University of California, Irvinegrad.bio.uci.edu/ecoevo/ahebling/Research/GK-12_files/Egg_Presentation.pdf · Osmosis Diffusion of water molecules through](https://reader030.fdocuments.us/reader030/viewer/2022041202/5d4d6ccf88c993af638b5f23/html5/thumbnails/1.jpg)
Diffusion and Osmosis
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Selectively Permeable Some substances can
pass through themembrane while othercannot
Why is this important?– Cells must let in
needed materials(oxygen, food) whilegetting rid of wasteproducts.
![Page 3: Diffusion and Osmosis - University of California, Irvinegrad.bio.uci.edu/ecoevo/ahebling/Research/GK-12_files/Egg_Presentation.pdf · Osmosis Diffusion of water molecules through](https://reader030.fdocuments.us/reader030/viewer/2022041202/5d4d6ccf88c993af638b5f23/html5/thumbnails/3.jpg)
Diffusion Molecules move from an
area of higherconcentration to anarea of lowerconcentration
What causes diffusion?– Random motion of
molecules2
3
14
WaterDissolvedmolecules
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Osmosis Diffusion of water
molecules through aselectively-permeablemembrane– Dissolved molecules
(i.e. glucose, starch)are called solutes
– The liquid they aredissolved in is calledthe solvent
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Effects of Osmosis on Cells
[water] = [solute]
Low [water]outside cell
High [water]outside cell
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Transportation of Molecules Passive Transport
– Movement of dissolvedmolecules through amembrane WITHOUTusing cellular energy
Active Transport– Movement of molecules
through a membraneUSING cellular energy
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Egg-speriment
VinegarSugarsyrup
Distilledwater
Coloredwater Cola
DietCola
Saltwater Alcohol
Demonstrate the effects of osmosis using anegg to model a cell– Dissolve eggshells in vinegar (weak acid)– Submerge eggs in different aqueous environments– Measure volume of liquid remaining and egg
circumference to determine movement of water