Human BodyHeart
Your blood vessels would wrap around the planet twice.
Laid end to end they run about 60,000 miles, nearly all of it microscopic.
Source
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More human body facts
Human body facts about the one you are sitting in. Roughly 8% of your DNA came from ancient viruses, you almost certainly have mites living on your face, and a newborn can breathe and swallow at the same time. Every fact links to the reference behind it.
- Across mammals, a lifetime works out at roughly a billion heartbeats whether you are a shrew or an elephant.
- Your heart contains its own small nervous system — tens of thousands of neurons that keep it beating and adjusting after every nerve from the brain has been cut.
- You make two million red blood cells every second.
- Deoxygenated blood is dark red, never blue.
- Roughly 8% of human DNA came from ancient viruses.
- Cells cross the placenta in both directions during pregnancy.