The<unk>  <unk>  (or visceral<unk>  system) is the part of the peripheral<unk>  system that acts as a control system, maintaining homeostasis in the body.  These maintenance activities are primarily performed without conscious control or sensation.  The<unk>  has far reaching effects, including: heart rate, digestion, respiration rate, salivation, perspiration, diameter of the pupils, micturition (the discharge of urine), and sexual arousal.  Whereas most of its actions are involuntary, some<unk>  functions work in tandem with the conscious mind, such as breathing.  Its main components are its sensory system, motor system (comprised of the parasympathetic<unk>  system and sympathetic<unk>  system), and the enteric<unk>  system.
The<unk>  is a classical term, widely used throughout the scientific and medical community. Its most useful definition could be: the sensory and motor neurons that innervate the viscera. These neurons form reflex arcs that pass through the lower brainstem or medulla oblongata. This explains that when the central<unk>  system (CNS) is damaged experimentally or by accident above that level, a vegetative life is still possible, whereby cardiovascular, digestive and respiratory functions are adequately regulated.
Autonomic nervous system
Sympathetic nervous system
Parasympathetic nervous system
Circulatory system
Vestibular system
Cerebral circulation
Lymph vascular system
Coronary circulation