Anatomy & Physiology › Section R · Blood vessels and circulation › Topic R.1

Structure and function of blood vessels

Every blood vessel is built for the job it does where it sits. Thick elastic walls absorb each surge from the heart, muscular walls steer the flow, walls one cell thick allow exchange, and thin stretchy veins store most of the blood.

In this topic

  • A closed loop of tubes
  • Three tunics
  • Arteries and veins compared
  • Three kinds of artery
  • Three kinds of capillary
  • Capillary beds
  • Venules and veins as reservoirs
  • Worked example: how much blood is in the veins?
  • Worked example: naming a vessel from its wall
  • Common mistakes to avoid
  • Key takeaways

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