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Three blood vessels (Arteries (Relationship between structure and…

- - - - to withstand high blood pressure
    - - alters diameter of lumen to vary blood flow.
    - - allow the walls to stretch when blood is pumped into the artery and then recoil, smoothing blood flow.
    - - to provide a low friction surface to ease blood flow.
    - - The high pressure prevents blood flowing backwards, so valves are not necessary
- - - - gives it a large volume which acts as a blood reservoir.
    - - to stop backflow of blood.
    - - no pulse of blood so no stretching and recoiling occurs
    - - so the blood can flow under low pressures.
- - - - allows rapid exchange between blood and tissues.
    - - Small diameter help with diffusion
      - White blood cells can squeeze between cells of the wall