What is the parasympathetic nervous system

   One of the peripheral, autonomic nervous systems

Explanation:  The parasympathetic nervous system is part of the overall nervous system of the organism and has the function of controlling those actions in the body that take place unconsciously, i.e. when we are not aware of them. This means, for example, regulating the metabolism, expansion and contraction of the pupil of the eye when changing light flux, activating certain reactions to stimuli that we did not consciously do, etc. This parasympathetic nervous system is important for body rest and energy balance.

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