http://videos.howstuffworks.com/hsw/16822-the-circulatory-system-blood-pressure-video.htm
Short and sweet...gives the basics.
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WACKY FACTS ABOUT THE HUMAN BODY
The acid in your stomach is strong enough to dissolve razorblades. While you certainly shouldn’t test the fortitude of your stomach by eating a razorblade or any other metal object for that matter, the acids that digest the food you eat aren’t to be taken lightly. Hydrochloric acid, the type found in your stomach, is not only good at dissolving the pizza you had for dinner but can also eat through many types of metal.
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