Chapter 5 sp11

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Chapter 5 sp11

  1. 1. <ul><li>Chapter 5 </li></ul><ul><li>Life’s Border: The Plasma Membrane </li></ul>
  2. 2. The Plasma Membrane <ul><ul><li>All cells have a plasma membrane that serves as the interface between the cell and the world outside it </li></ul></ul><ul><ul><ul><li>defines the outer boundary of each cell </li></ul></ul></ul><ul><ul><ul><li>selectively permeable </li></ul></ul></ul><ul><ul><ul><li>Made up of 4 components (pg. 92): </li></ul></ul></ul><ul><ul><ul><ul><li>Phosopholipid bilayer </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Cholesterol (structural support) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Proteins </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Glycocalyx (carbohydrate chains) </li></ul></ul></ul></ul>
  3. 3. The Plasma Membrane
  4. 4. Plasma Membrane Structure <ul><ul><li>Composed of a phospholipid bilayer </li></ul></ul><ul><ul><li>Fluid mosaic model (pg. 95) </li></ul></ul><ul><ul><ul><li>Proteins are embedded in this double lipid layer and give the membrane its mosaic character. </li></ul></ul></ul>
  5. 5. Phospholipid Bilayer
  6. 6. Roles of Membrane Proteins
  7. 7. Transport Across Membranes <ul><li>The plasma membrane regulates the passage of molecules into and out of the cell </li></ul><ul><li>Two types: </li></ul><ul><ul><li>Passive transport </li></ul></ul><ul><ul><ul><li>No energy required </li></ul></ul></ul><ul><ul><ul><li>Move down a concentration gradient </li></ul></ul></ul><ul><ul><li>Active transport </li></ul></ul><ul><ul><ul><li>Energy required </li></ul></ul></ul><ul><ul><ul><li>Move against a concentration gradient </li></ul></ul></ul>
  8. 8. Passive Transport: Diffusion <ul><li>Diffusion is the net movement of solute molecules down a concentration gradient (pg. 96) </li></ul><ul><ul><li>movement is from high to low concentration </li></ul></ul><ul><ul><li>continues until an equilibrium is reached </li></ul></ul><ul><ul><li>a drop of dye in water illustrates diffusion </li></ul></ul>
  9. 9. Diffusion of Liquids
  10. 10. Please note that due to differing operating systems, some animations will not appear until the presentation is viewed in Presentation Mode (Slide Show view). You may see blank slides in the “Normal” or “Slide Sorter” views. All animations will appear after viewing in Presentation Mode and playing each animation. Most animations will require the latest version of the Flash Player, which is available at http://get.adobe.com/flashplayer.
  11. 11. Facilitated Diffusion: Help from Proteins <ul><li>No energy is required </li></ul><ul><li>Passive transport of materials through the plasma membrane that is aided by a transport protein (pg. 99) </li></ul>
  12. 12. Please note that due to differing operating systems, some animations will not appear until the presentation is viewed in Presentation Mode (Slide Show view). You may see blank slides in the “Normal” or “Slide Sorter” views. All animations will appear after viewing in Presentation Mode and playing each animation. Most animations will require the latest version of the Flash Player, which is available at http://get.adobe.com/flashplayer.
  13. 13. Diffusion through Membranes: Osmosis <ul><ul><li>Osmosis is the passive transport of water across a selectively permeable membrane </li></ul></ul><ul><ul><ul><li>From a high water concentration (low solute) to a low water (high solute) concentration </li></ul></ul></ul><ul><ul><ul><li>Cells will gain or lose water relative to their surroundings </li></ul></ul></ul><ul><ul><ul><ul><li>pg. 96 - 98 </li></ul></ul></ul></ul>
  14. 14. Cell in Isotonic Solution CELL 20% NaCL 80% H 2 O 20% NaCL 80% H 2 O The cell is at _______________. equilibrium ENVIRONMENT NO NET MOVEMENT
  15. 15. Cell in HypOtonic Solution ( hypo = less than) CELL 10% NaCL 90% H 2 O 20% NaCL 80% H 2 O What is the direction of water movement? Water moves in and cell swells
  16. 16. Cell in Hypertonic Solution ( hyper = more than) CELL 30% NaCL 70% H 2 O 20% NaCL 80% H 2 O What is the direction of water movement? ENVIRONMENT Water moves out and cell shrinks
  17. 17. Osmosis & Cell Environments
  18. 18. Please note that due to differing operating systems, some animations will not appear until the presentation is viewed in Presentation Mode (Slide Show view). You may see blank slides in the “Normal” or “Slide Sorter” views. All animations will appear after viewing in Presentation Mode and playing each animation. Most animations will require the latest version of the Flash Player, which is available at http://get.adobe.com/flashplayer.
  19. 19. Active Transport <ul><li>During active transport cells use energy to move substances against a concentration gradient. </li></ul><ul><ul><li>pg. 99 </li></ul></ul>
  20. 20. Please note that due to differing operating systems, some animations will not appear until the presentation is viewed in Presentation Mode (Slide Show view). You may see blank slides in the “Normal” or “Slide Sorter” views. All animations will appear after viewing in Presentation Mode and playing each animation. Most animations will require the latest version of the Flash Player, which is available at http://get.adobe.com/flashplayer.
  21. 21. Bulk Transport (pg. 101) <ul><ul><li>Exocytosis </li></ul></ul><ul><ul><ul><li>Secretes substances outside of the cell. </li></ul></ul></ul>
  22. 22. Bulk Transport <ul><ul><li>Endocytosis </li></ul></ul><ul><ul><ul><li>Takes material into the cell. </li></ul></ul></ul><ul><ul><ul><ul><li>Pinocytosis = “cell drinking” </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Phagocytosis = “cell eating” </li></ul></ul></ul></ul>
  23. 23. Please note that due to differing operating systems, some animations will not appear until the presentation is viewed in Presentation Mode (Slide Show view). You may see blank slides in the “Normal” or “Slide Sorter” views. All animations will appear after viewing in Presentation Mode and playing each animation. Most animations will require the latest version of the Flash Player, which is available at http://get.adobe.com/flashplayer.
  24. 24. Diffusion Requires no energy Passive transport Higher solute concentration Facilitated diffusion Osmosis Higher water concentration Higher solute concentration Requires energy Active transport Solute Water Lower solute concentration Lower water concentration Lower solute concentration Fig 5.7 pg. 99
  25. 25. Chapter 5 Review <ul><li>What are the main functions of the plasma membrane? </li></ul><ul><li>What 4 components make up the plasma membrane? </li></ul><ul><ul><li>pg. 92-95 Fig 5.1 </li></ul></ul><ul><li>What is meant by the fluid mosaic model? (pg. 95) </li></ul><ul><li>Distinguish between passive and active transport. </li></ul><ul><li>What are the 3 examples of passive transport? </li></ul><ul><ul><li>pg. 99 Fig 5.7 </li></ul></ul><ul><li>Distinguish between diffusion and osmosis (pg. 96-98) </li></ul><ul><li>Distinguish between endocytosis & exocytosis (p.101) </li></ul><ul><li>Distinguish between pinocytosis & phagocytosis </li></ul>

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