Vessels

• Layers of blood vessel

  • Macle layer
  • Connective tissue
  • Muscle layer
  • Vessels
  • Endothelum
• Arteries


  • Carry blood under high pressure
  • Thick muscular walls
  • Small lumen (internal hole)
• Veins


  • Carry blood to the heart
  • Thin walls
  • Large lumen (internal hole)
  • Carry blood under low pressure
  • Have valves
• Capillaries


  • Connect arteries and veins
  • One cell thick
  • Carry blood under very low pressure
• All arteries carry oxygenated blood except for the pulmonary artery
• All veins carry deoxygenated blood except for the pulmonary vein
• Blood flows from the right side to the left side