Blood vessels

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  • BLOOD VESSELS
    • ARTERIES
      • Thick wall with thick layer or collagen
      • Endothelium folded
        • prevents damage as can stretch under pressure
      • Thick layer of elastic tissue
      • Thick layer of smooth muscle
        • Narrows lumen
        • Can carry, withstand and maintain high blood pressure
          • Thick layer of elastic tissue
          • Thick wall with thick layer or collagen
          • Endothelium folded
            • prevents damage as can stretch under pressure
    • VEINS
      • Carry blood at low pressures
        • not thick
      • Larger Lumen
        • ease of blood flow
      • Thin layers of collagen, smooth muscle and elastic tissue
      • contain valves
        • Prevent backflow of blood
      • Thin walls mean vein can be flattened by skeletal muscles
        • Pressure applied to force blood along
    • CAPILLARIES
      • Very thin
        • single layer of flattened endothelium
          • short diffusion distance
      • Narrow lumen
        • same diameter of red blood cell
          • ensures blood cells are squeezed so that they give up oxygen

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