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Remember solutions?

Understanding solutions, solutes, solvents, and cell transport in biology. Learn about passive transport, diffusion, osmosis, and the fluid mosaic model of the cell membrane. Helpful resources and explanations provided.

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Remember solutions?

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  1. Remember solutions?

  2. solutions Solutions have 2 parts solutes – particles that dissolve in solvent solvent – liquid in which solutes dissolve Ex: solvent: water solute: Kool-Aid solvent: water solute: Tea, Coffee

  3. solutions Solutions can have different concentrations, [ ] Solutions can be SATURATED * solvent cannot hold any more solute * if added, more solute will fall out of solution

  4. Cell transport Moving substances through the cell membrane

  5. Cell membrane • Fluidmosaic model – fluid: moving mosaic: design of small pieces • combination of different moveable molecules (lipids, carbs, proteins) http://www.youtube.com/watch?v=Qqsf_UJcfBc

  6. The primary component of the cell membrane

  7. Glycerol Fatty acids

  8. Glycerol Hydrophilic Fatty acids

  9. Glycerol Hydrophilic – love water Fatty acids Hydrophobic – fear water

  10. Phospholipidbilayer Outside cell: water & blood Inside cell: cytoplasm (water)

  11. I. Passive transport • Requires NO cell E • Particles pass through the c.m. w/their own kinetic E (bouncing/knocking each other through)

  12. A. (Simple) Diffusion • Movement of small, uncharged particles • O2, CO2 • Moving through phospholipidbilayer • From an area of [high] to [low] to reach equilibrium

  13. PASSIVE TRANSPORT • DIFFUSION some particles (CO2, O2),will diffuse straight through the lipid bilayer

  14. [Hi] This represents a [ ] gradient [Lo]

  15. [Hi] What will happen? [Lo]

  16. [Hi] Is it finished? [Lo]

  17. NO!

  18. [equilibrium]

  19. Moving down the gradient

  20. B. Facilitated Diffusion • Movement of small particles that have a charge or are slightly larger than O2, CO2 Ex: glucose, water • Move through specific protein channel/carrier • From an area of [high] to [low] to reach equilibrium

  21. Cell membrane: Proteins • Embedded PROTEINS

  22. Cell membrane: Proteins • Embedded PROTEINS

  23. PASSIVE TRANSPORT • DIFFUSION other particles (ex: glucose) will have to pass through the protein channels

  24. C. Osmosis (facilitated diffusion) • Movement of water • Moving through special protein channel, aquaporin • From an area of [high] of water to [low] of water to reach equilibrium

  25. comparing a cell to surrounding solution

  26. comparing a cell to surrounding solution H2O H2O H2O H2O H2O H2O

  27. This is how cells are affected Lyse Normal Plasmolyzed Turgid/turgor pressure

  28. osmosis

  29. Osmosis lab…

  30. https://www.youtube.com/watch?v=Fh7UvXEP_jo

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