And do they put carbon dioxide inside those oxygen tubes?
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100% oxygen isn’t deadly in the short term (e.g. oxygen bars seem to be pointless but largely harmless.) That said, it’s not what you want long term, and does have serious toxicity.
Oxygen is very useful to us precisely because it loves to react chemically. Having oxygen lets us make WAY more ATP than we could without it. It’s also likely to react with all kinds of stuff, which is a real strain on the system. Oxidative stress can kill cells.
Air is about 21% oxygen, which is what we’re used to. It’s the level where our lungs are already getting what they need. You want “enough oxygen to make energy” without “so much that it reacts with everything.”
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