The human circulatory system was once a subject of great mystery, but now, modern science has revealed its inner workings. Here are 11 surprising facts about the human circulatory system.
via LiveScience.com http://www.livescience.com/39925-circulatory-system-facts-surprising.html
via LiveScience.com http://www.livescience.com/39925-circulatory-system-facts-surprising.html
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