Inside a Muscle · Muscles
Dense capillary networks — and contraction squeezes them shut.
Muscle is thirsty tissue. Every fibre is threaded with capillaries, and during hard exercise your muscles can claim the large majority of your entire blood supply, borrowed from organs that can wait.
There's more: dense capillary networks — and contraction squeezes them shut. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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