The parasympathetic nervous system is responsible for maintaining balance in the body. It works in opposition to the sympathic nervous system, which is responsible for the fight or flight response.

  • The parasympathetic nervous system is activated when you are feeling relaxed.

  • The parasympathetic nervous system is activated when you are feeling scared or threatened.

Definition of parasympathetic


originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels


parasympathetic nervous system


of or relating to the parasympathetic nervous system

Nearby Words

parasympathetic Pronunciation in a video

Example Sentences for parasympathetic

  • 1

    It contains the sensory and parasympathetic fibers of the facial nerve.

  • 2

    Parasympathetic ganglia of the head and neck.

  • 3

    Parasympathetic root of ciliary ganglion.

  • 4

    Parasympathetic input uses the neurotransmitter acetylcholine.

  • 5

    It has both sympathetic and parasympathetic innervation.

  • 6

    The muscle has parasympathetic and sympathetic innervation.

  • 7

    The parasympathetic nervous system is entirely cholinergic.

  • 8

    I believe this is sometimes referred to as parasympathetic overreaction.

  • 9

    Only parasympathetic fibers form synapses in the ganglion.

  • 10

    It is the most rostral of the parasympathetic nuclei in the brain stem.