– Why do people pass out when subjected to high g-forces?
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Your brain is high up in the body. When G-forces are strong, it literally pulls the blood downwards through your body and blood is literally taken away from the brain. You pass out – hopefully temporarily – from oxygen deprivation since there’s no blood carrying oxygen reaching the brain for a little while.
Suits can pressurize around your lower body, preventing the blood from pooling down there, basically squeezing it back upwards, and giving you a much better chance at staying awake.
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