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Very interesting analogy, although perhaps taking a bit of imagination. Perhaps a subway station would be a better analogy. I'm thinking of the capillaries being trains, perhaps the Red blood cells being the train cars. The alveolar/capillary walls and the pores of Kohn would be the doors. The Alveoli would be the walkways. Air being crowds of people milling about. As the RBC's pass by, the Carbon Dioxide gets off the train, passes through the capillary walls and into the alveoli joining the crowds of "air" milling about, while oxygen passes the other way. I believe it is all a passive process. So the boarding / deboarding is only a will to go where fewer Oxygen or Carbon Dioxide molecules are. And in theory it could be two way with excess oxygen getting off, and perhaps reboarding. And Carbon Dioxide getting off and back on too. But, in general, more carbon dioxide gets off and more oxygen gets on.

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Q: Why do wesay that the lungs work like a train station?
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