Blood vessels and their functions Edexcel AS


  • Outer wall contains collagen which makes the outer wall tough
  • Thick layer of elastic fibres to allow recoil after high pressure, oushing blood forward
  • Narrow lumen to maintain high pressure
  • No valves because blood is always being forced forward by heart and elastic recoil of arteries


  • Outer layer of connective tissue and collagen makes the wall tough
  • Thin walls which don't have much elastic fibre or smooth muscle because the blood…


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