Movin ’ On Out Molecules in Motion
The Gatekeeper <ul><li>Cell membrane </li></ul><ul><li>Selectively permeable </li></ul>
Permeable <ul><li>Oxygen </li></ul><ul><li>Water </li></ul><ul><li>Carbon dioxide </li></ul>
Not Permeable <ul><li>Some large molecules </li></ul><ul><li>Salts </li></ul>
Methods of Movement <ul><li>Diffusion </li></ul><ul><li>Osmosis </li></ul><ul><li>Active transport </li></ul>
Diffusion <ul><li>Molecules are ALWAYS moving. </li></ul><ul><li>Molecules bump into each other. </li></ul><ul><li>Collisi...
Osmosis <ul><li>the diffusion of water molecules </li></ul><ul><li>Water moves from an area of higher concentration to an ...
Passive Transport <ul><li>Moving materials through the cell membrane through osmosis or diffusion does not require much en...
Active Transport <ul><li>Cell uses energy to move materials through a cell membrane. </li></ul><ul><li>Transport Proteins ...
Active Transport (cont’d) <ul><li>Another form: Engulfing </li></ul><ul><li>-cell membrane surrounds particle and cell mem...
Why are cells so small?? <ul><li>Cytoplasm carries materials throughout the cell. </li></ul><ul><li>If a cell is too large...
Why are cells so small? (cont’d) <ul><li>So… a cell that is too large could not function well enough to survive. </li></ul...
Answers to the Study Guide Pages 58-59
1.  Define  osmosis . <ul><li>Diffusion of  water molecules  through a selectively permeable membrane. </li></ul>
2.  What happens to a red blood cell when there is no longer a lower concentration of water outside the cell than inside t...
3.  What happens to a red blood cell when there is a higher concentration of water outside the cell than inside the cell? ...
4.  Define  passive transport . <ul><li>The movement of materials through a cell membrane  WITHOUT USING ENERGY ! </li></ul>
5.  Name  2  examples of passive transport. <ul><li>Diffusion and osmosis. </li></ul>
6.  Define  active transport . <ul><li>USES ENERGY to move substances through a cell membrane. </li></ul>
7.  An example of active transport is when the cell moves molecules in the __________ direction. <ul><li>Opposite (lower t...
8.  What is the difference between active and passive transport? <ul><li>Active transport uses energy to move substances, ...
9.  What are  transport proteins ? <ul><li>Transport proteins pick up molecules outside the cell and carry them in or out....
10.  Name 3 substances transport proteins move in and out of cells. <ul><li>calcium, potassium, sodium </li></ul>
11.  Describe the steps in transport by engulfing. <ul><li>The cell membrane surrounds a particle.  The cell membrane pinc...
12.  How is a molecule moved through a cell? <ul><li>It is carried by a stream of moving cytoplasm. </li></ul>
13.  What would happen if a cell became too large??? <ul><li>The cell would not function well enough to survive.  It would...
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Movin’ On Out

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  • Movin’ On Out

    1. 1. Movin ’ On Out Molecules in Motion
    2. 2. The Gatekeeper <ul><li>Cell membrane </li></ul><ul><li>Selectively permeable </li></ul>
    3. 3. Permeable <ul><li>Oxygen </li></ul><ul><li>Water </li></ul><ul><li>Carbon dioxide </li></ul>
    4. 4. Not Permeable <ul><li>Some large molecules </li></ul><ul><li>Salts </li></ul>
    5. 5. Methods of Movement <ul><li>Diffusion </li></ul><ul><li>Osmosis </li></ul><ul><li>Active transport </li></ul>
    6. 6. Diffusion <ul><li>Molecules are ALWAYS moving. </li></ul><ul><li>Molecules bump into each other. </li></ul><ul><li>Collisions cause molecules to push away from one another </li></ul><ul><li>Molecules continue to spread out evenly throughout the area. </li></ul>
    7. 7. Osmosis <ul><li>the diffusion of water molecules </li></ul><ul><li>Water moves from an area of higher concentration to an area of lower concentration through the cell membrane. </li></ul><ul><li>See Fig.5 </li></ul>
    8. 8. Passive Transport <ul><li>Moving materials through the cell membrane through osmosis or diffusion does not require much energy—this is passive. </li></ul>
    9. 9. Active Transport <ul><li>Cell uses energy to move materials through a cell membrane. </li></ul><ul><li>Transport Proteins “pick up” molecules outside the cell and carry them in, using energy. They also take molecules out by the same method. </li></ul>
    10. 10. Active Transport (cont’d) <ul><li>Another form: Engulfing </li></ul><ul><li>-cell membrane surrounds particle and cell membrane pinches off to form a vacuole using energy. </li></ul>
    11. 11. Why are cells so small?? <ul><li>Cytoplasm carries materials throughout the cell. </li></ul><ul><li>If a cell is too large, it take a longer time for a molecule to reach its center. </li></ul><ul><li>It would also take a long time for wastes to be removed. </li></ul>
    12. 12. Why are cells so small? (cont’d) <ul><li>So… a cell that is too large could not function well enough to survive. </li></ul><ul><li>When a cell reaches a certain size, it divides into two cells. </li></ul>
    13. 13. Answers to the Study Guide Pages 58-59
    14. 14. 1. Define osmosis . <ul><li>Diffusion of water molecules through a selectively permeable membrane. </li></ul>
    15. 15. 2. What happens to a red blood cell when there is no longer a lower concentration of water outside the cell than inside the cell? <ul><li>If there is too much salt in the cell, the water moves out of the cell by osmosis. The cell shrinks. </li></ul>
    16. 16. 3. What happens to a red blood cell when there is a higher concentration of water outside the cell than inside the cell? <ul><li>The water moves into the cell causing the cell to swell. </li></ul>
    17. 17. 4. Define passive transport . <ul><li>The movement of materials through a cell membrane WITHOUT USING ENERGY ! </li></ul>
    18. 18. 5. Name 2 examples of passive transport. <ul><li>Diffusion and osmosis. </li></ul>
    19. 19. 6. Define active transport . <ul><li>USES ENERGY to move substances through a cell membrane. </li></ul>
    20. 20. 7. An example of active transport is when the cell moves molecules in the __________ direction. <ul><li>Opposite (lower to higher) </li></ul>
    21. 21. 8. What is the difference between active and passive transport? <ul><li>Active transport uses energy to move substances, and passive transport does not require energy. </li></ul>
    22. 22. 9. What are transport proteins ? <ul><li>Transport proteins pick up molecules outside the cell and carry them in or out. </li></ul>
    23. 23. 10. Name 3 substances transport proteins move in and out of cells. <ul><li>calcium, potassium, sodium </li></ul>
    24. 24. 11. Describe the steps in transport by engulfing. <ul><li>The cell membrane surrounds a particle. The cell membrane pinches off to form a vacuole within the cell. </li></ul>
    25. 25. 12. How is a molecule moved through a cell? <ul><li>It is carried by a stream of moving cytoplasm. </li></ul>
    26. 26. 13. What would happen if a cell became too large??? <ul><li>The cell would not function well enough to survive. It would divide into 2 cells. </li></ul>

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