A single red blood cell can circulate your entire body in 20 seconds!

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Red_blood_cell
Red blood cell by Database Center for Life Science (DBCLS), (CC BY 3.0)

In spite of the fact that the human body has millions of veins and arteries, blood can make a complete circulation in as little as 20 seconds. It circulates for about 100 to 120 days before being recycled.

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