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In: Biology
You are not a 100% efficient oxygen extraction machine. There’s still a lot of oxygen in your breath. Less than pure air would have, to be sure, but not 0%. (It’s actually about 16%-18% oxygen.) Your blood *is* pretty much saturated, but your breath is not depleted of oxygen in the doing.
Lungs that aren’t breathing are bringing in 0% new oxygen. *Some* is better than *none.*
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