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Dictionary » P » Parasympathetic

Parasympathetic

parasympathetic

Pertaining to a division of the autonomic nervous system.

See: autonomic nervous system. 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.


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Help! Cutting the vagus nerve and force of contraction

Vangeek is right. If we bring out the heart from body and cut its nerves thoroughly you can see that HR will increase. Vagus is a parasympathetic nerve. It shows that heart in normal situation is more affected by parasympathetic nerves. Now I think it's clear why cutting vagus can increase

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by behzad
Mon Aug 10, 2009 8:14 am
 
Forum: Physiology
Topic: Help! Cutting the vagus nerve and force of contraction
Replies: 3
Views: 898

Flu symptoms...sympathetic or parasympathetic?

Are the responses to pathogen invasion (eg. increased body temperature) initiated by the sympathetic nervous system OR the parasympathetic nervous system? I would guess that it would be parasympathetic ("rest and digest")...but on the other hand, I could see how it could be ...

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by SysBio
Tue Jul 07, 2009 11:26 pm
 
Forum: Human Biology
Topic: Flu symptoms...sympathetic or parasympathetic?
Replies: 1
Views: 165

Re: Regulation of a heartbeat

Hello guyz Conditions which lead to sympathetic stimulation like lead to increase heart rate and force of contraction Conditions that lead to parasympathetic stimulation like lead to decrease heart rate but have nothing to do with contractility as no innervation to muscles of atria and ventricles ...

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by sanjidcapa
Tue May 05, 2009 9:18 am
 
Forum: Physiology
Topic: Regulation of a heartbeat
Replies: 2
Views: 1333

Re: Vagus Nerve

... heartbeat regulating system ( in cardiovascular system (anatomy): Nervous control of the heart ) Nervous control of the heart is maintained by the parasympathetic fibres in the vagus nerve (parasympathetic) and by the sympathetic nerves. The vagus nerve is the cardiac inhibitor, and the sympathetic ...

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by sanjidcapa
Tue May 05, 2009 9:15 am
 
Forum: Human Biology
Topic: Vagus Nerve
Replies: 16
Views: 39273

Regulation of a heartbeat

ANS connects to SA node via dual innervation: First from sympathetic nervous system (Spinal nerve T1-4) Second from parasympathetic nervous system(Cranial nerve CN-X) Sympathetic stimulation lead to increase rate of SA impulses so increase heart rate Parasympathetic stimulation lead ...

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by MohammedAmer
Wed Apr 22, 2009 4:45 pm
 
Forum: Physiology
Topic: Regulation of a heartbeat
Replies: 2
Views: 1333
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