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Remember solutions?. 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. solutions.
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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
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
Glycerol Fatty acids
Glycerol Hydrophilic Fatty acids
Glycerol Hydrophilic – love water Fatty acids Hydrophobic – fear water
Phospholipidbilayer Outside cell: water & blood Inside cell: cytoplasm (water)
I. Passive transport • Requires NO cell E • Particles pass through the CM w/their own kinetic E (bouncing/knocking each other through)
A. (Simple) Diffusion • Movement of small, uncharged particles • O2, CO2 • Moving through phospholipidbilayer • From an area of [high] to [low] to reach equilibrium
[Hi] This represents a [ ] gradient [Lo]
[Hi] What will happen? [Lo]
[Hi] Is it finished? [Lo]
Passive transport O2 O2 O2 O2 Diffusion
Passive transport O2 O2 O2 O2 Diffusion
Passive transport CO2 CO2 CO2CO2 Diffusion
Passive transport CO2 CO2 CO2 CO2 Diffusion
B. Facilitated (aided/helped) 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
Cell membrane: Proteins • Embedded PROTEINS
Passive transport Carrier protein/ protein channel
Passive transport Facilitated diffusion Osmosis
Passive transport Facilitated diffusion Osmosis
C. Osmosis (a form of 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
Passive transport H2O Aquaporin Facilitated diffusion & Osmosis
comparing a cell to surrounding solution environment cell
comparing a cell to surrounding solution H2O H2O H2O H2O H2O H2O
This is how cells are affected Lyse Normal Plasmolyzed Turgid/turgor pressure
PASSIVE TRANSPORT • DIFFUSION diffusion vid
osmosis • osmosis vid
Cell membrane Remind you of anything?
PASSIVE TRANSPORT • DIFFUSION some particles (CO2, O2),will diffuse straight through the lipid bilayer
PASSIVE TRANSPORT • DIFFUSION other particles (ex: glucose) will have to pass through the protein channels