The Great Gas Swap · Lungs
The waste gas crosses even more easily than oxygen.
Going the other way is carbon dioxide, the waste from every cell in your body. It crosses the alveolar wall even more readily than oxygen does — despite having a much gentler gradient to travel down.
There's more: the waste gas crosses even more easily than oxygen. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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