I cant make sense of it in my head.
In: 4
The small part of blood vessels are called capillaries most of them are so small a single blood cell can pass through them at once.
Most living g tissues are within 1-3 cells with of a capillary
The are only 5-10 micrometers wide. Human head hair is 80 to 100 micrometers wide. So if you put them side by side you have 8 to 20 capillaries. Bot both are 3D so the cross section area is 8^2=64 to 20^2×400 times more. If we pick the average of 7.5 and 90 we get 12x and 144x
Lest say 10 x with and 100x area for hair
On average a human body has 100,000 hair on the head.
60,000 miles is 96,560km less say 100,000 km. That means you need to have 1 km long hair for the total length to be 100,000km. But if every hair is replaced by 144 capillaries you only need 1000/144 = a 6.9-meter-long bundle thick as all human head hair.
1-meter long human head hear results in 100km total head hear length and capillaries are a lot thinner.
All hair on the head does not have a large total correction. You look at how small it gets it is when a person with a long hard put comment around it like a scrunchie.
Silk has an average diameter of 10-12 micrometers so capillaries are a bit smaller.
So if you have a lot of very thin fiber and a relativity short rope the total fiber length can still be enormous.
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