Updated: 4/20/2020
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Storyboard Text

  • Susie Goes to the Doctor
  • One day Susie noticed an enlarged vein on the back of her leg.
  • Dr. Heartman informed Susie that she had a varicose vein and explained how they are formed.
  • Valves in the vein that prevent blood from flowing backwards don't work
  • This causes excess blood to push against the vein wall and expand
  • He also explained to Susie the structural difference between veins and arteries, and why we don't see varicose arteries.
  • Veins have a thin layer of smooth muscle in the wall, while arteries maintain a tight cylindrical shape
  • Because arteries are so close to the heart, they must be able to withstand high pressures, which will keep the blood moving
  • Even with a faulty valve, pressure in the arteries is so great, that it will continue to push blood through and not build up
  • On the other hands, the blood in veins doesn't move with the same pressure as it does in the arteries and will sometimes be pulled with gravity
  • Our circulatory system consist of veins, which take de-oxygenated blood to the heart, and arteries which pump oxygenated blood to the rest of the body
  • On the way out, Dr. Heartman told Susie how her blood returns to her heart.
  • Our circulatory system works with our respiratory system to help us breath, and our urinary system to excrete waste
  • Thanks Doc!
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