cell membrane

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  • cell membrane
    • cell membaranes acts as a barrier annd controls what enters and exits (its selectively permable)
      • In 1972 the "fluid mosiac model" was suggested to describe the plasma membrane
        • fluid : movement of phospholipid, flexible structure
        • mosiac: different companantes vary in shape size pattern like mosiac tiles
    • phospholipid bilayer
        • Hydrophillic phospate heads -  love water
        • Hydrophobic tails - hate water
        • it keeps the membrane fluid but stable
      • permability of membrane
        • small non polar molecules diffuse rapidly
        • small polar molecules diffuse at slower rates
        • ions cant freely diffuse as they have a charge
        • large particles cant freely diffuse because its too big
        • its semi permable
    • Transport protiens
      • intrinstic or intergral
        • spans the whole layer (from the outer to inner layer)
          • it transports stuff from one end to the other
            • this is where the cell is selectively permable as only specific substrates can pass through
      • extrisntic or periphal
        • only goes through halfway  (could be inner or outer)
          • cell signalling with the glycoprotiens
    • Cholesterol
      • its embedded into the phopholipids (binds to the tails) and adds structural stability to the membrane
        • hydrophobic - hates water
        • more cholosterol -> less fluid-> less permable
    • Glycolipid
      • Glycoprotien
        • carbohydrates bonded to protien
          • the carbohydrates acts as a receptor for cell signlling or hormones
      • carbohydrates bonded to lipids
        • the carbohydrates acts as a receptor for cell signlling or hormones
    • membrane fluid
      • its neccasry for diffusion of substances through the membrane


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