I wonder, would it be possible that the human body has some sort of "shutdown mechanism" when it realizes that it simply doesn't have enough resources to carry

I wonder, would it be possible that the human body has some sort of "shutdown mechanism" when it realizes that it simply doesn't have enough resources to carry on as usual? I imagine this mechanism would turn off the pain centers and the fight or flight responses needed for survival and instead make the experience of passing away more acceptable, relaxing, maybe even pleasant. Steve Jobs' last words were: "Oh wow, oh wow, oh wow". I can't help but wonder what he was "wowing" about?