Questions and Answers
What is the role of the sinoatrial (SA) node in the heart?
Controls the contraction of the atria
Why does the right side of the heart contract slightly sooner than the left side?
Due to asynchronous contraction caused by nerve impulse transmission
What is the function of an electrocardiogram (ECG)?
To represent a composite record of the heart’s electrical events
What is essential for a valid ECG tracing?
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Which part of the heart initiates the electrical impulse that spreads across the atria?
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What is the purpose of cardiac conduction in controlling heart muscle activity?
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What is the function of the right and left crus in the heart?
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Which part of the heart is primarily responsible for the depolarization of the atria before contraction?
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What does the QRS complex in an ECG signal?
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What does a T-wave represent in an ECG waveform?
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In a normal ECG phase, when do the ventricles contract?
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What can large low spaces on an ECG graph indicate about the heart's function?
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