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Moving  Cellular  Materials Power Point
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Moving Cellular Materials Power Point

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

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