Well, I believe there's some sort of pump included in the nervous system. If that pump shut down, you'd die instantly, so you'd die instantly if the systems shut down.
It's also highly unlikely that the digestive system would "shut down", as it begins in the mouth.
What would happen if the nervous system was not functioning properly? How would this affect the muscular system?
If one of the organs in the digestive system, then.
You would die.
you will die
The nervous system, muscles, glands (endocrine system), the heart, lungs and the digestive system all work together as a whole. Without the nervous system none of this would be possible.
You would die
It wouldn't be able to move!
It would depend on which body system you are talking about. i.e. nervous, digestive, etc.
you will not have enough blood cell cause they will die
I would offer: The circulatory system, the nervous system including all the sensory systems, the respiratory system, the lymph system, the alimentary/digestive systems.
you would need to put food up your asss
If the digestive system broke down, the muscular system would no longer receive nutrients. It would start to break down as well. The body would weaken, and tasks would become more difficult.