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Did you know that an adult

human heart beats over 100,000

times a day? How many times

would it beat in a year?

This is a drawing of the inside of a human

heart. To see where the atriums, ventricles,

veins and vales are located, visit this page at

Ask a Biologist.

http://askabiologist.asu.edu/expstuff/images/heart.gif