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32 Cards in this Set
- Front
- Back
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The inherent rate: SA Node
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60–100 bpm
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The inherent rate:AV Junction
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40–60 bpm
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The inherent rate:Ventricles
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20–40 bpm
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The site with the fastest rate will be the __________.
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pacemaker.
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Parasympathetic stimulation causes:
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Decreased heart rate
Decreased AV conduction Decreased irritability |
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Sympathetic stimulation causes:
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Increased heart rate
Increased AV conduction Increased irritability |
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_________is when the electrical charges are balanced and ready for discharge.
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Polarization
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________is the discharge of energy that accompanies the transfer of electrical charges across the cell membrane.
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Depolarization
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____________is the return of electrical charges to their original state of readiness.
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•Repolarization is the return of electrical charges to their original state of readiness.
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The heart has two types of cells:
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Electrical cells, which initiate and conduct impulses
Mechanical cells, which contract in response to stimulation |
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__________are graphic representations of electrical activity.
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Arrhythmias
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__________can occur without mechanical response (pulse).
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Electrical activity can occur without mechanical response (pulse).
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The _____ ______influences both the atria (i.e., the SA node, the intraatrial and internodal pathways, and the AV junction) and the ventricles; the parasympathetic branch influences only the atria.
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The sympathetic branch
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Electrode contact can be improved by:
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Abrading the skin
Cleaning or drying the skin Using a contact medium |
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If electricity flows toward the _________ electrode, the patterns produced on the graph paper will be upright; if the electrical flow is toward the _________ electrode, the patterns will be inverted.
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positive/negative
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Vertical lines on the graph paper measure ______; horizontal lines measure ______.
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Time/Voltage
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A small square on the graph paper (the distance between two light vertical lines) is ____ seconds.
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0.04
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A large square on the graph paper (the distance between two heavy vertical lines) is ____ seconds.
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0.20
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The _______ normally contract before the _____ do.
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The atria normally contract before the ventricles do.
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The _______ represents atrial depolarization
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P wave
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The ________represents delay in the AV node.
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The PR segment
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The PR interval includes the P wave and the PR segment, and represents both ________________and delay in the ____________.
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atrial depolarization and delay in the AV node.
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The PRI is measured from the beginning of the _______ to the beginning of the _____ complex.
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The P wave to the beginning of the QRS complex.
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The PRI is normally between ____and _____ seconds.
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0.12 and 0.20 seconds.
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The QRS complex represents ______ ________.
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ventricular depolarization.
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The QRS interval is measured from the beginning of the _____to the end of the _____.
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Q wave/S wave.
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The ______is the first negative deflection following the P wave but before the R wave.
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The Q wave
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The ____is the first positive wave following the P wave, or the first positive wave of the QRS complex.
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The R wave is the first positive wave following the P wave, or the first positive wave of the QRS complex.
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The QRS interval is normally less than ______seconds.
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The QRS interval is normally less than 0.12 seconds.
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The______ ________period occurs when the cells cannot respond to any stimulus at all.
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The absolute refractory period occurs when the cells cannot respond to any stimulus at all.
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The absolute refractory period encompasses the _____and the first part of the __wave.
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The absolute refractory period encompasses the QRS and the first part of the T wave.
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The ____ ______ period is the downslope of the T wave.
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The relative refractory period is the downslope of the T wave.
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