Tissue-paper thin but tough, the valves of the the human 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

 Beautiful: The Inside of the Heart!</p><br /><p>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. </p><br /><p>Info & Photo from Natural Geographic
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