The Cell Surface Membrane

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  • The Cell Surface Membrane
    • Phospholipids
      • Hydrophilic heads
        • interact with the water and protect the tails
      • Hydrophobic tails
        • protected from water on both sides
      • Function:
        • allow lipid soluble substances to enter and leave the cell
        • prevent water-soluble substances entering and leaving the cell
        • make the membrane flexible
    • Proteins
      • Extrinsic
        • Either partly embedded or on the surface.
        • Provide mechanical support to the membrane
        • cell receptors for molecules such as hormones
      • Intrinsic
        • Proteins which completely span the phospholipid bilayer
        • carries which transport water soluble material across the membrane
        • enzymes
      • Functions
        • structural support
        • receptors
          • hormones
        • help cells to adhere together
        • form recognition sites by identifying cells
        • active transport across membrane by forming ion channles
        • carriers transporting water-soluble substances across membranes
    • Fluid Mosaic Model
      • Fluid
        • flexible allowing movement and change of shape
      • Mosaic
        • different shaped and sized proteins embedded in the bilayer
    • Components
      • Cholestrol
        • adds strength
      • Glycolipid
        • recognition site
        • branch off the bilayer
      • Glyco-protein
        • recognition site
        • branches of proteins embedded in the membrane


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