system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: 'Death rattles'

I mean the way, in T.V shows where a seemingly dead person exhales, does this really happen? If so, why?
gpt
Usually in medicine we refer to death rattle as the sound most humans make when they are close to death. They will breathe in and it sounds like a rattle due to their lungs filling with fluids. If they take that last breath of air before they die it would make the same sound if they had the rattle before death.