centrioles, cilia and flagella

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  • Centrioles, flagella, cilia
    • Centrioles
      • Only in animal cells
      • make and organise microtubules
        • made of a protein called tubulin
        • During cell division- microtubules form the spindle
    • Flagella
      • long, thin extensions from the cell
        • Cilia
          • Cilia are shorter structures found in large numbers
      • Flagella are longer and usually found in ones or twos
      • Usually cause the cell to swim through a liquid
    • Cilia
      • Cilia are shorter structures found in large numbers
  • Produce movement
    • Found in some animal cells but rarely in plant cells
  • Contain microtubules arranged in a 9+2 arrangement
    • ie) 2 microtubules in centre
      • + a ring made of nine microtubule pairs
        • movement is formed by these microtubules moving against each other
  • The movement of the cilia can move fluids over the surface of the cell
    • eg) lining of the bronchus, cilia in throat

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