Your blood vessels could circle Earth twice
If laid end to end, your blood vessels would circle Earth twice.
Reviewed by the CurioVault curator · 8 October 2026 · Last updated 28 September 2026 · Editorial standards
If laid end to end, your blood vessels would circle Earth twice. The network includes arteries, veins, and microscopic capillaries, totaling an estimated 100,000 kilometers. Capillaries alone make up 80,000 km, so thin that red blood cells squeeze through single file to deliver oxygen. This vast plumbing fits inside you because vessels branch like a fractal tree, getting smaller and more numerous. Your heart pumps 7,500 liters daily through this system. It is the largest delivery network you will ever own, built without a single road crew, constantly repairing itself as you age.
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