Seems like we breath so fast? So how does the exchange happen so quickly?
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Not sure which of the two you’re asking;
Your lung is more of a sponge than it is a balloon. So when you breathe in, it has lots of surface area to exchange air with, so a lot can be exchanged within a short time.
You don’t breathe the same oxygen out as carbon dioxide you just took into your body, the CO2 molecules are made with oxygen you breathed in previously.
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