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Circulatory System
Cardiac Conduction Terms
8
Health Care
Not Applicable
04/01/2009

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Term
sinoatrial node (SA node)
Definition
the pacemaker; highly specialized neurological tissue, embedded in the wall of the right atrium, responsible for initiating electrical conduction of the heartbeat, causing the atria to contract and firing conduction of impulses to the AV node
Term
atrioventricular node (AV node)
Definition
neurological tissue int he center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His
Term
bundle of His
Definition
neurological fibers, extending fromt he AV node to the right and left bundle branches, that fire the impulse from the AV node to the Purkinje fibers
Term
Purkinje fibers (network0
Definition
fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
Term
polarization
Definition
resting; resting state of a myocardial cell
Term
depolarization
Definition
change of a myocardial cell from a polarized (resting) state to a state of contraction.

de = not
polarization = resting
Term
repolarization
Definition
recharging fo the myocardial cell from a contracted state back to a resting state (re = again; polarization = resting)
Term
normal sinus rhythm (NSR)
Definition
regular rhythm of the heart cycle stimulated by the SA node (average rate of 60 to 100 beats/minute)
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