system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why, when someone dies from something that does not permanently damage anything vital, they can not be "restarted" or brought back to life?

Just wondering why, for example, if someone is cut and loses enough blood and dies, they can't simply "replace" the blood and get everything working again? I get that if someone's brain or heart is damaged and can't be repaired then they can't be resuscitated... but what makes every form of death completely permanent? Like if someone drowns, I imagine everything is undamaged; why can't they be brought back to life?
gpt
Blood is the method that the body uses to distribute oxygen from the lungs to the rest of the body. Without blood, your brain isn't going to get oxygen, which is actually what kills you, not the blood loss itself.

Same goes for drowning: You're not getting O2 to your brain, so your brain dies.