Autonomic nervous system or internal life,vegetative system coordinates the activities of internal organs and autonomic functions of the body (nutrition, breathing, circulation, excretion, etc.).
Autonomic nervous system consists of two components which, are functionally antagonistic: sympathetic nervous system and parasympathetic nervous system, the first being a "consumer" and the second being the repairing one.
The two aspects of the neurovegetative system, which is the metabolic regulator, the sympathetic nervous system, which is the dynamic group and the parasympathetic nervous system, which is the anabolic group or relaxing group, are closely correlated with critical events which are evolving between activity (matter's wear) and standby (regeneration of matter). In functional terms, these two antagonistic systems work like pedals of a piano, which strengthens or suppress it sounds.
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