3/23 electrical activity of the heart / the ECG
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| 2 specialized types of cardiac muscle cells | contractile myocardial cells and non contractile autorhythmic cells
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| __cells responsible for the mechanical pumping of the heart | contractile myocardial cells
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| 99% for cardiac muscle tissue are ___ cells | contractile myocardial cells
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| ___ cells of the conduction system are responsible for electrical stimulation of myocardial cells | non contractile autorhythmic cells
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| __cells are 1% of cardiac muscle tissue | non contractile autorhythmic cells
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| __cells spontaneously depolarize via slow movement of + ions through channels leading to threshold then generating an AP | autorhythmic cells
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| AP travels throught the conduction system triggering the contraction of | the surrounding myocardial tissue
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| different parts of the hearts conduction system have their own _ rate | autorhythmicity rate
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| 4 Components of the conduction system | SA node, AV node, AV Bundle, and Purkinje fibers
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| autorhythmicity rate of 70 beats/min | SA node
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| autorhythmicity rate of 50 beats/min | AV node
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| autorhythmicity rate of 35 beats/min | AV bundle
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| autorhythmicity rate of 30 beats/mini | Purkinje fibers
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| a recording of the electrical changes that accompany the cardiac cycle | electrocardiogram (ECG)
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| represents the depolarization of the atria as a wave of negativity spreads from the SA node toward the ventricles | P wave
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| represents the spread of excitation throught the ventricular myocardium resulting in depolarization of ventricular muscle | QRS complex
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| atrial repolarization is masked by | the large QRS deflection
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| represents the repolarization of the ventricles | T wave
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| represents the interval between the activation of the SA node and the AV node | P-R interval
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| represents the interval between atrial depolarization and ventricular depolarization | P-R segment
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| represents the interval between the end of the S wabe and the start of the T wave, ventricles are uniformly excited | S-T segment
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| represents the interval of time between successive cycles | R-R interval
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| flattened T wave= | heart muscle is ischemic
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| enlarged ST segment= | acute myocardial infarctions
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| enlarged R= | enlarged ventricles
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