The Alveoli · Lungs
Around 500 million microscopic air sacs — the actual point of lungs.
At the end of the smallest tube sits a cluster of tiny bubbles, like a bunch of grapes. There are roughly 500 million of them in your chest, each about a fifth of a millimetre across. These are the alveoli, and this is where breathing finally does something.
There's more: around 500 million microscopic air sacs — the actual point of lungs. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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