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Facilitated Diffusion
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Facilitated Diffusion

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  • 1. Facilitated Diffusion & Active Transport
  • 2. Facilitated Diffusion
    • Movement of molecules from a high concentration to a are of low concentration with the help of carrier proteins
    • Passive Transport mechanism
    • Still moving from HIGH to LOW
  • 3. Reasons molecules cannot pass through:
    • Too Large
      • Use Carrier Proteins
      • Glucose Example
    • Insoluble (cannot dissolve through membrane)
      • Use ION Channels
  • 4. Ion Channels
    • Allow charged particles (ie: Na+ Cl-) that are insoluable in the membrane to pass through
    • Two Types
      • Open channels: always open; cell cannot regulate movement of ions
      • Gated Channels: may be open or closed; cell has control
      • http://www.northland.cc.mn.us/biology/Biology1111/animations/passive1.swf
  • 5. Active Transport
    • http://www.northland.cc.mn.us/biology/Biology1111/animations/active1.swf
  • 6. Active Transport
    • Movement of materials from an area of LOW concentration to an area of HIGH concentration (AGAINST concentration gradient)
    • Requires use of ATP energy (cell energy)
  • 7. Sodium-Potassium Pump
    • Moves sodium and potassium against its concentration gradient
      • Moves 3 Na out & 2 K in
      • Requires use of ATP energy
    • Necessary to reset your nerve cells after an impulse has been transmitted
    • See your handout on this.
  • 8.
    • http: //highered . mcgraw-hill .com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html
  • 9. Endocytosis
    • Process by which cells bring in large quantities of food, water, or nutrients
    • http://www.northland.cc.mn.us/biology/Biology1111/animations/active4.html
    • Two types
      • Pinocytosis-bringing in of fluids (cell drinking
      • _Phagocytosis -bringing in of large molecules (cell eating)
  • 10. Exocytosis
    • Removal of waste
      • CELL POOPING
      • Vesicle containing the materials fuses to the cell membrane then opens and releases the materials to the outside