The Alveoli · Lungs
Folded into bubbles, the exchange surface covers about 70 square metres.
Spread all your alveoli out flat and they would cover roughly 70 square metres — about half a tennis court, folded into a space the size of your ribcage.
There's more: folded into bubbles, the exchange surface covers about 70 square metres. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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