I learned in biology that we have something called residual volume of air in our lungs. I saw a video on a sub showing the lack of oxygen through a burning fire. There were comments that if you went in that space you will pass out. There were stories about how a Chinese teacher passed out while tying his shoelace but students survived since they were standing up. Most humans can hold their breath for 10 seconds at least. So why is it that when you go into a tiny space with no oxygen but dense co2, you will pass out?
In: Biology
When you hold your breath, you’re holding that residual oxygen in your lungs. If you keep breathing, you’re releasing it. If you then take in a breath that contains no oxygen, you’re running out of oxygen dramatically faster than if you had just held it in.
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