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Beautiful: The Inside of the Heart!
Tissue-paper thin but
tough, the valves of the human heart open and close to pump 6 quarts of
blood a day through 60,000 miles of vessels. That's equivalent to 20
treks across the United States from coast to coast.
Info & Photo from Natural Geographic
Tissue-paper thin but
tough, the valves of the human heart open and close to pump 6 quarts of
blood a day through 60,000 miles of vessels. That's equivalent to 20
treks across the United States from coast to coast.
Info & Photo from Natural Geographic
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