The Great Gas Swap · Lungs
The iron-containing molecule that actually carries the oxygen.
Oxygen barely dissolves in water, and blood is mostly water — so blood cheats. Packed inside every red blood cell are around 250 million molecules of hemoglobin, each able to grab and hold four oxygen molecules.
There's more: the iron-containing molecule that actually carries the oxygen. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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