You would immediately cease to live, because your brain is part of the nervous system. And no commands would be sent to the body, thus shutting the body down.
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.
You would die.
Depressants are a category of substances that slow down the central nervous system.
The nervous system is divided into two major parts called the central nervous system (CNS), which is made up of the brain and spinal cord, and the peripheral nervous system (PNS). The peripheral nervous system is broken down into the somatic nervous system and the autonomic nervous system. Scientists further divide the autonomic nervous system into the sympathetic and the parasympathetic nervous system.
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.
sympathetic division of the autonomic nervous system
Calms you down
Heroin
If you had no nervous system, you would not be able to move, feel any sensation, experience any emotion or thought. If parts weren't there, for example, the spinal cord, you would lose all physical sensation from your spinal cord down and would have to breath through a respirator. You would not be able to move. If your brainstem went missing, you'd be dead. This controls heartbeat and respiration. If your brain went missing, you wouldn't even know you existed. If your autonomic nervous system went missing, you would be dead because your heart would stand still in your chest.
it can be changed by letting your nervous system come down by telling someone what your nervous or by stop being nervous.
The nervous system
A drug that slows down the activity of the central nervous system is called a depressant. Examples of depressants are Xanax, Librium and Amytal.