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Definition
| to expand; period in the cardiac cycle when blood enters the relaxed ventricles from the atria |
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Definition
| to contract; period in the cardiac cycle when the heart is in the contraction and blood is ejected through the aorta and pulmonary artery |
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Term
| sinoatrial node (SA node) |
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Definition
| the pacemaker; high specialized neurological tissue, embedded in the wall of the right atrium, responsible for initiating electrical conduction of the heart beat, causing the atria to contract and firing conduction of impulse to the AV node |
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Term
| atrioventricular node (AV node) |
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Definition
| neurological tissue in the 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 from the 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 (network) |
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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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| 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 state to a state of contraction |
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Definition
| recharging of the myocardial cell from a contracted state back to a resting state |
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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 |
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