Blood Vessels

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Capillaries

  • One cell thick walls
  • Allow for rapid diffusion
  • Slow blood travel
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Vein

  • Large lumen
  • Contain valves
  • Tough outer layer of collegen fibres
  • Thin muscle layer
  • Smooth inner surface
  • Less resistance to blood passing through
  • Dont maintain high pressures
  • Stop backflow
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Arteries

  • Smooth lining
  • Smooth muscle and elsatic fibres
  • Small lumen (when unstretched)
  • High blood pressures
  • Expand wth blood flow
  • Carry blood away from heart
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