The Alveoli · Lungs
Air and blood, separated by less than a micrometre.
The barrier between the air in your lungs and the blood in your body is thinner than the skin of a soap bubble — under a micrometre, hundreds of times thinner than a sheet of paper.
There's more: air and blood, separated by less than a micrometre. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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