Blood vessels part 2

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Blood vessels

  • All blood vessels- inner layer/ lining- made from a single layer of cells- endothelium
  • Particularly smooth- reduce friction with flowing blood

Arteries

  • Carry blood away from heart- high pressure
  • Small lumen- maintain pressure
  • Thick walls- contain collagen- high strength
  • Wall has elastic tissue- wall can stretch & recoil when heart pumps- recoiling maintains high pressure while heart relaxes
  • Wall contains smooth muscle- can contract & constrictthe arter- contriction narrows the lumen (in aterioles- limits blood flow to certain organs or tissues- can be directed to other tissues)
  • Endothelium is folded & can unfold when artery stretches

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