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Dictionary » N » Norepinephrine

Norepinephrine

norepinephrine --> noradrenaline

(Science: drug, hormone) catecholamine neurohormone, the neurotransmitter of most of the sympathetic nervous system (of so called adrenergic neurons): binds more strongly to _ adrenergic receptors. Stored and released from chromaffin cells of the adrenal medulla. A catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses.


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The Heart

... and slows down heart rate by slowing the rate of action potentials that are fired, thus slowing the overall speed of contractions. Likewise norepinephrine/noradrenaline speed up the firing of APs and so speed heart beating. The last bit's just telling you that norepinephrine can also be ...

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by Babybel56
Sat Apr 23, 2011 6:51 pm
 
Forum: Human Biology
Topic: The Heart
Replies: 6
Views: 6622

cardiac system

... pacemaker potential of the SA node and thus reduce heart rate. Under conditions of physical or emotional activity sympathetic nerve fibers release norepinephrine, which acts to speed up the pacemaker potential of the SA node thus increasing heart rate. Sympathetic nervous system activity also causes ...

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by BioJunior
Sat Apr 23, 2011 9:18 am
 
Forum: Human Biology
Topic: cardiac system
Replies: 0
Views: 625

Anyone experience runner's high?

neurotransmitters, chemical messengers in the brain that regulate everything we do and feel. Low levels of serotonin and/or norepinephrine are related to depression, excess levels of dopamine to schizophrenia, low levels of GABA to anxiety, etc. Among the many neurotransmitters produced ...

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by tomkkk
Sat Oct 02, 2010 1:51 am
 
Forum: General Discussion
Topic: Anyone experience runner's high?
Replies: 0
Views: 1352

Re: Regulation of a heartbeat

... to muscles of atria and ventricles There are other factors which contribute to heart rate regulation like direct action of Epinephrine and NorEpinephrine also there are physical factors like local warming of SA which lead to increased heart rate,cooling which lead to decreased heart rate,there ...

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by sanjidcapa
Tue May 05, 2009 9:18 am
 
Forum: Physiology
Topic: Regulation of a heartbeat
Replies: 2
Views: 11904

Regulation of a heartbeat

... to muscles of atria and ventricles there are other factors which contribute to heart rate regulation like direct action of Epinephrine and NorEpinephrine (Adrenaline&NorAdrenaline),also there are physical factors like local warming of SA which lead to increased heart rate,cooling which ...

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by MohammedAmer
Wed Apr 22, 2009 4:45 pm
 
Forum: Physiology
Topic: Regulation of a heartbeat
Replies: 2
Views: 11904
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