Term
| sinoatrial node (SA node) |
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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 |
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Term
| atrioventricular node (AV node) |
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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 |
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Term
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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 |
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Term
| Purkinje fibers (network0 |
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Definition
| fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract |
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Term
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Definition
| resting; resting state of a myocardial cell |
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Term
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Definition
change of a myocardial cell from a polarized (resting) state to a state of contraction.
de = not
polarization = resting |
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Term
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Definition
| recharging fo the myocardial cell from a contracted state back to a resting state (re = again; polarization = resting) |
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Term
| normal sinus rhythm (NSR) |
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Definition
| regular rhythm of the heart cycle stimulated by the SA node (average rate of 60 to 100 beats/minute) |
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