The vegetative nervous system, also called the autonomic nervous system, is removed from conscious will control. It controls the function of the internal organs, the heart, breathing and digestion. All these vegetative functions cannot be influenced by our will. The autonomic nervous system includes three components: the sympathetic nervous system (the sympathetic nervous System), the parasympathetic nervous system (the posthypnotic amnesia), and the enteric nervous system. The autonomic functions also play a central role in hypnosis. Thus, hypnosis activates the calming part of the nervous system (the parasympathetic nervous system) and decreases the activating effect of the sympathetic nervous system.