Dictionary » P » 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: 11648

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: 1041

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: 90569

Please Help - The Heart

... Nervous System Diastole Bundles & Conductive Fibers EKG Cardiac Cycle Sinoatrial Node Ventricular Systole 1. Sinoatrial Node the heart’s “pacemaker”, a mass of conductive tissue which produces the signal that initiates each new heart beat. 2. ___________________________ a mass of conductive ...

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by PleaseHelp
Sun Feb 21, 2010 10:03 pm
Forum: General Discussion
Topic: Please Help - The Heart
Replies: 5
Views: 8847

heart information

... I need to summarize about the heart work, the ecg, electrodes, heart ultrasound, systole & diastole & heartbeat, heat pumps, heart valves, pacemaker… And the most difficult is to search after medicine test heart & medicine devices that test the hart Please I need help If anybody here ...

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by kio
Mon Nov 23, 2009 11:52 am
Forum: General Discussion
Topic: heart information
Replies: 1
Views: 1122
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