The Alveoli · Lungs
A mesh so fine that red cells pass through in single file.
Wrapped around every air sac is a net of blood vessels so fine that red blood cells squeeze through one at a time — which is exactly the point. Nobody gets to hide in the middle of the stream.
There's more: a mesh so fine that red cells pass through in single file. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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