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Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
Facilitated Diffusion
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Facilitated Diffusion

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

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