BLOOD VESSELS

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ARTERIES

Arteries carry blood away from the heart.

They have an elastic stretchy structure that gives the ability to withstand the high pressure of blood being pumped from the heart. arteries are made up of 3 layers: endothelium (tunica interna), smooth muscle (tunica media) and connective tissue (tunica externa). The structure of an artery is as follows:

  • arteries have thick walls-this is to withstand the high pressure of blood.
  • arteries have a small lumen because they have a thick wall
  • arteries do not have valves because blood is pumped at a high pressure

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