Facilitated Diffusion
- 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