system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do high amounts of g-force make you pass out?
gpt
It is harder to pump blood toward the brain in opposition to high acceleration. In effect it behaves as if it were heavier like the rest of your body feels. Hard to raise your arm? Hard to pump blood up too.

The thing is, if your brain doesn't get blood it tends not to work.