Dictionary » P » Parasympathetic nervous system

Parasympathetic nervous system

Definition

noun

A division of the (vertebrate) autonomic nervous system whose physiological effects are mostly in opposition to those of the sympathetic nervous system; e.g. it is involved in the slowing of the heart beat and relaxing the muscles.


Supplement

The parasympathetic neurons lie between the brain and the spinal cord. Most of them have cholinergic nerve endings (i.e. involving acetylcholine as neurotransmitter) and their responses are mediated by muscarinic receptors. They are known to produce responses that inhibit or oppose the actions of the sympathetic nervous system. Whereas the sympathetic nervous system is responsible for the fight-or-flight responses the parasympathetic nervous system is mainly involved in responses or effects found during rest, sleep and digestion. The system innervates the salivary glands, thoracic and abdominal viscera, bladder and genitalia where the physiological effects produced are involuntary, such as stimulating digestive secretions, slowing heart rate, constricting the pupils, dilating the blood vessels, etc.


Compare: sympathetic nervous system

See also: autonomic nervous system


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Re: Help with biological metaphor?

... but you could check the sympathetic and parasympathetic nervous systems. The former could represent the financial aspects of your ...

See entire post
by Gaudwin
Mon Jun 17, 2013 12:12 am
 
Forum: General Discussion
Topic: Help with biological metaphor?
Replies: 10
Views: 4898

Re: What are some ways to boost your immune system?

Your adaptive immune system gets naturally stronger whenever it gets into ... life, meditating - anything that activates your parasympathetic nervous system, because it is like the reverse state of fight-or-flight ...

See entire post
by caban
Tue Mar 13, 2012 9:06 am
 
Forum: General Discussion
Topic: What are some ways to boost your immune system?
Replies: 12
Views: 6580

Re: GI tract and enteric nervous system

... break this question up for you. The peripheral nervous system is broken up into two systems the autonomic and the ... that they woulld split the autonomic system up into parasympathetic and sympathetic systems. Further they thought ...

See entire post
by daniel.kurz
Fri Oct 28, 2011 6:31 am
 
Forum: Human Biology
Topic: GI tract and enteric nervous system
Replies: 1
Views: 6254

GI tract and enteric nervous system

I am just wondering, enteric nervous system is part of autonomic nervous system right and it works together with parasympathetic and sympathetic branches? But here it says in the ...

See entire post
by snezka18
Sun May 08, 2011 8:02 am
 
Forum: Human Biology
Topic: GI tract and enteric nervous system
Replies: 1
Views: 6254

The Heart Rate

How does the Sympathetic and Parasympathetic nervous systems affect the heart rate? I know the Sympathetic increases while ...

See entire post
by BioJunior
Sat Apr 30, 2011 2:26 am
 
Forum: Human Biology
Topic: The Heart Rate
Replies: 0
Views: 1088
View all matching forum results

This page was last modified 01:35, 25 July 2009. This page has been accessed 11,613 times. 
What links here | Related changes | Permanent link