Facilitated Diffusion
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Facilitated Diffusion

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    Facilitated Diffusion Facilitated Diffusion Presentation Transcript

    • Facilitated Diffusion & Active Transport
    • 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
    • Reasons molecules cannot pass through:
      • Too Large
        • Use Carrier Proteins
        • Glucose Example
      • Insoluble (cannot dissolve through membrane)
        • Use ION Channels
    • 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
    • Active Transport
      • http://www.northland.cc.mn.us/biology/Biology1111/animations/active1.swf
    • 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)
    • 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.
      • http: //highered . mcgraw-hill .com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html
    • 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)
    • Exocytosis
      • Removal of waste
        • CELL POOPING
        • Vesicle containing the materials fuses to the cell membrane then opens and releases the materials to the outside