Which part of the conduction system initiates the depolarizing impulse, which spreads throughout the heart?
electrical activity in the heart
What does the ECG wave tracing represent?
What does the QRS complex represent in the ECG wave tracing?
Contraction of the atria results from which wave of depolarization on the ECG tracing?
Which part of the intrinsic conduction system delays the impulse briefly before it moves on to the ventricles?
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