Bio 3 - Unit 3: Diffusion and Osmosis Instructor: Cheryl...

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Unformatted text preview: Unit 3: Diffusion and Osmosis Instructor: Cheryl Dunham Office: 102 LeFevre Hall Box: 114 LeFevre Hall KNOW YOUR VOCABULARY Diffusion Diffusion the movement of molecules from an area of [ ] (concentration) to an area of [ ] Concentration gradient the difference in solute [ ] between two solutions the greater the difference in [ ], the higher or steeper the [ ] gradient diffusion depends on a concentration gradient http://epswww.unm.edu/coursinf/eps462/graphics/diffusion.gif Diffusion Cells have semi-permeable membranes phospholipids and proteins membranes allow some but not all molecules through molecules passively move through channels in the membrane through diffusion http://content.cdlib.org/xtf/data/13030/n2/ft796nb4n2/figures/ft796n b4n2_00012.jpg Diffusion Factors that affect diffusion molecules through cell membranes Concentration gradient direct relationship (as [ ] gradient increases, so does rate of diffusion) Temperature direct relationship (as temperature increases, so does the rate of diffusion) Molecular/Particle Size some particles are too large to get through the pores in the membrane they must be small enough to fit through membrane pores http://www.facstaff.bucknell.edu/kfield/organelles/ Osmosis Osmosis the movement of water molecules across a [ ] gradient Osmosis occurs when solute molecules themselves cannot diffuse across the membrane Tonicity depends on those molecules that cannot diffuse Osmosis Tonicity Hypertonic relative term describing a solution that has more solute particles than another solution Hypotonic relative term describing a solution that has fewer solute particles than another solution Isotonic relative term describing a solution that has the same amount of solute particles as another solution Osmosis Water moves from hypOtonic solutions to hypeRtonic solutions (OR => O to R) Hypotonic solutions have a higher water potential than hypertonic solutions Hypertonic solutions have a lower water potential than hypotonic solutions Hypotonic Hypertonic http://faculty.southwest.tn.edu/rburkett/GB1-os21.jpg Hypotonic Hypertonic Osmosis Water moves from...
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Bio 3 - Unit 3: Diffusion and Osmosis Instructor: Cheryl...

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