Dictionary » P » Pacemaker

Pacemaker

pacemaker

1. (Science: apparatus, physiology) An object or substance that influences the rate at which a certain phenomenon occurs, often used alone to indicate the natural cardiac pacemaker or an artificial cardiac pacemaker.

2. (Science: biochemistry) A substance whose rate of reaction sets the pace for a series of interrelated reactions.


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The Heart

... from the bottom upwards (so the ventricles can empty themselves before the atria contract to fill them up again). The SA node's also known as the pacemaker since it sets the rate at which the whole system moves. (Incidentally it's one of the few parts of the nervous system that works completely ...

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by Babybel56
Sat Apr 23, 2011 8:26 pm
 
Forum: Human Biology
Topic: The Heart
Replies: 6
Views: 8723

cardiac system

... sympathetic and parasympathetic nerve fibers. Under conditions of rest the parasympathetic fibers release acetylcholine, which acts to slow the pacemaker potential of the SA node and thus reduce heart rate. Under conditions of physical or emotional activity sympathetic nerve fibers release norepinephrine, ...

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by BioJunior
Sat Apr 23, 2011 9:18 am
 
Forum: Human Biology
Topic: cardiac system
Replies: 0
Views: 805

Poisoned by antibiotics...can anyone help?

... him. Finally, he luckily found a cardiologist who knew exactly what was wrong with him, immediately scheduled him for surgery, and installed a pacemaker. Before that most of the doctors told him that he had an anxiety disorder, that it was "all in his head" and one doctor flat out ...

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by ladykat324
Sun Aug 08, 2010 5:44 am
 
Forum: Human Biology
Topic: Poisoned by antibiotics...can anyone help?
Replies: 23
Views: 66210

Poisoned by antibiotics...can anyone help?

... unexplained electrical disturbance in my heart causing this long term cardiac arrythmia and prolongation of the QT wave. I was told I may need a pacemaker and given Propranolol. After one week of treatment I was sent home. I was also diagnosed with a bruit, and a heart murmer and told to take ...

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by Lesley998
Wed Oct 21, 2009 9:56 pm
 
Forum: Human Biology
Topic: Poisoned by antibiotics...can anyone help?
Replies: 23
Views: 66210

controling Nerve of the Brain? Which One

... for example, for the Netter atlas of anatomy and physiology http://www.netterimages.com/images/vpv/000/000/004/4584-0550x0475.jpg As for the pacemaker fibers of the heart, there is much more to be said. You need to understand that the SA node can maintain a steady rhythm of 80 beats/minute ...

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by MrMistery
Mon Feb 16, 2009 2:39 pm
 
Forum: General Discussion
Topic: controling Nerve of the Brain? Which One
Replies: 8
Views: 15671
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