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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
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