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12 Cards in this Set
- Front
- Back
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The sinoatrial node has a common name. What is it?
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Pacemaker
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Which two chambers of the heart (atria or ventricles) contract last in a normal cardiac cycle?
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Ventricles
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What two chambers are stimulated immediately after the SA node depolarizes?
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Atria
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After the AV node depolarizes, what structures conduct the impulse to the myocardium of the ventricles?
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bundle branches
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What are the main events recorded by an ECG?
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depolarizations and repolarizations occurring in heart muscles
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What electrical event in the heart does the QRS complex represent?
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depolarization of ventricles
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Ventricular repolarization is represented by which part of an ECG?
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T wave
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What ECG wave is represented by the atrial depolarization?
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P wave
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Why is the ECG event indicating atrial repolarization not seen in an ECG?
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Because it is buried in the QRS
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What does a heart block do to impulse transmission in the heart?
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Can slow it down or stop it
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What consequence does fibrillation have for cardiac muscle contraction and for the pumping efficiency of the heart? Which is more serious - atrial or ventricular fibrillation?
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It quivers, doesn't contract. Ventricular more serious because no blood to lungs and system without
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If a myocardial infarct (heart attack) destroyed a portion of the right or left bundle branches, what potential change might you see in an ECG?
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Wide QRS
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