Nope. You are right. Your body, in any sort of extreme stress/life-or-death type situation, will prioritize your major organs far above anything else. This is why frostbite starts at the extremities; blood flow to them is shut down to focus the blood on the heart/brain/lungs in order to sustain life. Your body doesn't go, "gee, it's cold...let's shut down the heart to keep the fingers moving!" or "Man, I'm starving! That heart has lots of muscle, let's start on that before the arms/legs/abdominal muscles that aren't doing much right now." (Not a doctor, just a nurse's kid who reads a lot.)