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the claim

The total length of capillaries in the human body is about 100,000 kilometers.

the verdict
CONTESTED
the evidence cuts both ways
Recorded sources
3 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the total length of capillaries in the human body is about 100,000 kilometers?

Partly. One reference work states the total length of capillaries is about 100,000 kilometers, and another gives more than 100,000 km for blood vessels overall. However, a Skeptics StackExchange answer traces that figure to a 1920 estimate and cites a modern estimate of only 9,000-19,000 km of capillaries, while Wikipedia attributes 100,000 km to an early estimate for muscle capillaries in a high-muscle-mass body.

Verdict: CONTESTED · 3 sources for, 2 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 3
Human Body I
2012
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90, S. (2012). Human Body I. play.google.com. https://play.google.com/store/books/details?id=qTedAAAAQBAJ&source=gbs_api

Evidence against · 2
Are there 60,000 miles of blood vessels in the human body?
2013
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Are there 60,000 miles of blood vessels in the human body?. (2013). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/15582/are-there-60-000-miles-of-blood-vessels-in-the-human-body

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More for · 2
The Way Things Work Book of the Body
1979
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Amerongen, C. V. (1979). The Way Things Work Book of the Body. books.google.com. http://books.google.com/books?id=sNshAAAAMAAJ&dq=The+total+length+of+capillaries+in+the+human+body+is+about+100,000+kilometers.&hl=&as_pt=BOOKS&source=gbs_api

Contemporary Tissue Engineering and Regenerative Medicine
2026
Get citation
García-Gareta, E. & García-Aznar, J. M. (2026). Contemporary Tissue Engineering and Regenerative Medicine. play.google.com. https://play.google.com/store/books/details?id=z3ulEQAAQBAJ&source=gbs_api

More against · 1
Blood vessel - Wikipedia
Get citation
Blood vessel - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Blood_vessel

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