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As in the subject line, what percentage of capillaries in a human (expressed in terms of total length, I suppose) are located in the skin, as opposed to internal organs? Google scholar has not turned up anything obvious, but I'm an outsider so I may have missed the appropriate term.

Another followup question would be: if we're considering the amount of energy expended by the heart in pumping blood throughout the body, what's the percentage of that energy that is devoted only to (1) transporting blood to the skin and (ii) circulating blood through the skin via capillaries?

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