system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:When dying naturally, does the body manually shut itself off, or does the person's life just end abruptly?

The concept of death has always boggled my mind, but if their is anything that's always peaked my interest, it's death by natural causes. When someone dies naturally, what exactly does that mean? Does the body just manually shut it self down for no reason? Or does the body just cut off, like pulling the plug on a PC? I'm curious because the term "natural causes" has always befuddled me. What exactly constitutes something like that?
gpt
It doesn't shuts itself off. This would serve no evolutionary purpose.

When someone dies of natural causes, they suffer a major failure of a critical system that they require to continue living (e.g. a stroke or a heart attack). We refer to it as "natural causes" because as people age, it becomes inevitable that eventually one of these systems will fail, so it's considered a natural part of the life cycle. But the human body doesn't intentionally shut anything down; it just succumbs to an increasingly likely system failure.