Editing Autonomic nervous system (section)

===Parasympathetic nervous system===
{{Main|Parasympathetic nervous system}}
The parasympathetic nervous system has been said to promote a "rest and digest" response, promotes calming of the nerves return to regular function, and enhancing digestion. Functions of nerves within the parasympathetic nervous system include:{{citation needed|date=November 2014}}
* Dilating blood vessels leading to the GI tract, increasing the blood flow.
* Constricting the bronchiolar diameter when the need for oxygen has diminished
* Dedicated cardiac branches of the [[vagus]] and thoracic [[Accessory nerve|spinal accessory]] nerves impart parasympathetic control of the [[heart]] ([[myocardium]])
* Constriction of the pupil and contraction of the [[ciliary muscle]]s, facilitating [[Accommodation (eye)|accommodation]] and allowing for closer vision
* Stimulating [[salivary gland]] secretion, and accelerates [[peristalsis]], mediating digestion of food and, indirectly, the absorption of nutrients
* Sexual. Nerves of the peripheral nervous system are involved in the erection of genital tissues via the [[pelvic splanchnic nerves]] 2–4. They are also responsible for stimulating sexual arousal.