Autonomic nervous system innervation showing the parasympathetic craniosacral systems in blue details the sympathetics participate and cause peristalsis of the ductus deferens and closure of the internal urethral sphincter to prevent semen from entering the the parasympathetic nervous system uses chiefly acetylcholine ach as its . The autonomic nervous system and its effects on organs see image here thus this fear reaction is an important survival mechanism in the face of real danger the question is how is this related to anxiety attacks or the irrational fears that can wreck peoples lives. This feature is not available right now please try again later. The parasympathetic nervous system pns controls homeostasis and the body at rest and is responsible for the bodys rest and digest function the sympathetic nervous system sns controls the bodys responses to a perceived threat and is responsible for the fight or flight response the pns and sns are part of the ans or autonomic nervous system which is responsible for the involuntary . For some functions sympathetics and parasympathetics cooperate an example being parasympathetic nerves which are necessary for erection and sympathetics for ejaculation both the sympathetic and parasympathetic portions of the autonomic nervous system have a two neuron pathway from the central nervous system to the peripheral organ
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