January 26th, 2012 at 8:47PM
milesian: Inside the Heart Tissue-paper thin but tough, the valves of the human heart open and close to pump 6 quarts (0.9 liters) of blood a day through 60,000 miles (97,000 kilometers) of vessels. That’s equivalent to 20 treks across the United States from coast to coast. 

milesian:

Inside the Heart

Tissue-paper thin but tough, the valves of the human heart open and close to pump 6 quarts (0.9 liters) of blood a day through 60,000 miles (97,000 kilometers) of vessels. That’s equivalent to 20 treks across the United States from coast to coast. 

(via itssoovert-itscovert)

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    Except for mine. One of my valves doesn’t close all the way. >.
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    Inside the Heart Tissue-paper thin but tough, the valves of the human heart open and close to pump 6 quarts (0.9 liters)...
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131 notes Source: National Geographic
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