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
holding your breath does not stop blood flowing and if you had air in your lungs then you can hold your breath for as long as that air lasts and stay conscious. if you replace the air in your lungs with co2, then you will very quickly pass out. this is also why choke holds knock people unconscious. cutting off air to the lungs is inconvenient, cutting off blood to the brain is immediately dangerous.
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