Medical-Surgical Nursing Fifth Edition
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Automaticity | ability of the pacemaker cell to spontaneously initiate an electrical
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| Conductivity | the ablility of a cell to transmit an impulse from cell to cell
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| Contractility | the natural ability of myocardial fibers to shorten in response to an electrical stimulus
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| Depolarization | the change in a membrane potential from a negative to a positive state
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| Excitability | myocardial cells that contract in response to an impulse
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| Myocardial working cells | the ability of a cardiac working cell to respond to an electrical impulse
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| Pacemaker cells | cells that spontaneously generate an electrical impulse
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| Polarized | the condition of a cell in the resting state with positive and negative ions aligned on either side of the cell membrane
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| Refractory period | the stage in which a cell is resistant to stimulation
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| Sarcomere | portion of myocardial cell where calcium ions act on actin and myosin, causing myocardial contraction
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| P wave | represents atrial depolarization
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| PR interval | represents time need for sinus impulse to reach the AV node
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| QRS complex | represents ventricular depolarization
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| QT interval | total time for ventricular depolarization and repolarization
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| ST segment | represents the beginning of ventricular repolarization
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| Primary pacemaker of the heart | sinus (SA) node
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| Atrial Flutter | the saw-tooth or picket fence appearance of the P wave on an ECG
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| Cardiac dysrhythmia | is a disturbance or irregularity in the electrical system of the heart
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