What: "There are three main kinds of blood vessels: arteries, veins, and capillaries. When the blood is pumped out of your heart, it goes into your largest arteries, then moves into the smaller arteries, and into the capillaries. Capillaries are like bridges between your arteries and veins. They are such tiny blood vessels that you can't see them without a microscope. But these capillaries serve a very important purpose. They are like "traders," for it is through their thin walls that blood "trades," or exchanges food and oxygen for the waste materials that these body cells do not need. "

Writer: Not Stated

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Date: May 1 2014 5:54 PM