– Why do people pass out when subjected to high g-forces?

Question

– Why do people pass out when subjected to high g-forces?

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Answer 1

The heart is only so strong. It is used to pumping blood that weighs roughly 1 Kg per liter. At 9G, blood weights an equivalent of 9 Kg per liter. Under such conditions, without assistance the heart simply isn’t strong enough to pump enough blood out from the legs and lower abdomen to the brain in order to sustain consciousness.