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Moving Cellular Materials Power Point


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Moving Cellular Materials Power Point

  1. 1. Moving Cellular Materials
  2. 2. <ul><li>All cells take in food, oxygen , and other substances from the environment. </li></ul><ul><li>Waste material must also move out of a cell into the environment. </li></ul><ul><li>Food, oxygen, molecules, and waste must pass through the cell membrane. </li></ul>
  3. 3. <ul><li>All cells are surrounded by a cell membrane that separates the cell from the outside environment. </li></ul><ul><li>The cell membrane is selectively permeable which means some substances can pass through the membrane while others cannot . </li></ul>
  4. 4. Passive Transport <ul><li>Passive transport is the movement of materials through a cell membrane without the input of energy . </li></ul><ul><li>Molecules move from a more crowded area to a less crowded area WITHOUT </li></ul><ul><li>the use of energy. </li></ul>
  5. 5. Three types of Passive Transport Passive Transport Diffusion Osmosis Facilitated Diffusion
  6. 6. Diffusion <ul><li>Diffusion is the random movement of molecules from an area of higher concentration (more molecules) to an area of lower concentration (fewer molecules). </li></ul>
  7. 7. Dynamic Equilibrium <ul><li>Molecules will continue to move from one area into another until the number of molecules is equal in the two areas. </li></ul><ul><li>This is called dynamic equilibrium . </li></ul><ul><li>Molecules continue to move but there is no change in concentration. </li></ul>
  8. 8. Osmosis <ul><li>Osmosis is the diffusion of water molecules through a selectively permeable membrane. </li></ul>
  9. 9. Facilitated Diffusion <ul><li>Facilitated Diffusion is the passive transport of materials across the plasma membrane with the aid of transport proteins. </li></ul>
  10. 10. Active Transport <ul><li>Active transport is the movement of materials through a cell membrane using cellular energy . </li></ul><ul><li>Active transport involves using transport proteins which carry molecules from outside the cell to the inside. </li></ul><ul><li>In active transport molecules move from a less crowded area to a more crowded area WITH the use of energy. </li></ul>
  11. 11. Two types of Active Transport <ul><li>Endocytosis is a process in which a cell surrounds and takes in material from its environment. </li></ul><ul><li>Exocytosis is the expulsion or secretion of materials from a cell. </li></ul>