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Cell membrane structure
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Cell membrane structure

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Transcript

  • 1.  
  • 2.
      • Gatekeeper
      • Regulates what comes in and out of the cell
      • Main components: proteins and phospholipids
      • The cell membrane is selectively permeable
        • Allows some things through without energy, but not everything
  • 3.
    • All cells have a cell membrane
    • Functions :
      • Controls what enters and exits the cell to maintain an internal balance called homeostasis
      • Provides protection and support for the cell
    TEM picture of a real cell membrane.
  • 4.
      • Found only in plant cells and bacteria cells
      • Main function is support
  • 5.
      • phosopholipids
        • made of two sides: head and tail
        • the head is hydrophillic (able to interact with water)
        • the tail is hydrophobic (not able to interact with water)
  • 6.
    • Structure of cell membrane
    • Lipid Bilayer -2 layers of phospholipids
      • Phosphate head is polar (water loving)
      • Fatty acid tails non-polar (water fearing)
      • Proteins embedded in membrane
    Phospholipid Lipid Bilayer
  • 7.
      • carrier proteins
        • allow larger or difficult molecules to get through the membrane
        • sometimes they require energy to open/close like a door
        • other times they simply act as a tunnel
  • 8. Proteins Membrane movement animation Polar heads love water & dissolve. Non-polar tails hide from water . Carbohydrate cell markers Fluid Mosaic Model of the cell membrane
  • 9.
    • 4. Cell membranes have pores (holes) in it
      • Selectively permeable : Allows some molecules in and keeps other molecules out
      • The structure helps it be selective!
    Pores
  • 10. Outside of cell Inside of cell (cytoplasm ) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go to Section: Animations of membrane structure