circulatory systems- blood vessels

• what are the 3 different types of blood vessels?

  arteries, veins, capillaries
• what do artery's do?

  carry the oxygenated blood away from the heart
• what do veins do?

  carry deoxygenated blood back to the heart.
• what does the arteries structure include?

  thick and elastic walls, small lumen
• what does vein structure include?

  thin walls, large lumen and valves
• what does the capillary structure include?

  narrow lumen and a wall which is one cell thick
• capillaries have thin walls so they can easily complete gas exchange
• why do capillaries have permeable walls?

  so substances can diffuse in and out
• what do red blood cells do?

  Transport oxygen
• what do white blood cells do?

  Fight infections
• what do platelets do?

  helps blood clotting
• what is plasma?


  a liquid that carries everything