The Alveoli · Lungs
The soapy film that stops your air sacs collapsing shut.
A wet bubble wants to collapse. With 500 million of them in your chest that's a serious problem — and your lungs solve it by coating every sac with a slippery, detergent-like film called surfactant.
There's more: the soapy film that stops your air sacs collapsing shut. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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