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Inside a network of blood vessels (arteries, arterioles, capillaries, veins, venules).

While the length of some of these blood vessels are minuscule, if you could add all their lengths together, that would make 100 000 km in an average human body.

And that's about twice the circumference of the Earth !

More info could be find on

http://en.wikipedia.org/wiki/Blood_vessel

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13y ago

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