If a wave of depolarization travels directly away from a positive electrode, which direction does the ECG line go?, Downward (Negative deflection), Why does the ECG graph show a completely flat line during the PR interval?, The electrical signal is delayed inside the AV node, What causes the sharp, tall upward spike of the R wave?, The massive muscle walls of the main ventricles depolarizing, Why does Hypertrophic Cardiomyopathy (HCM) cause abnormally tall R waves and deep S waves?, Thicker heart muscle generates a much larger electrical voltage, What is the structural difference between an ECG Segment and an ECG Interval?, Segments are only flat lines; Intervals include both waves and flat lines, What is the mechanical action happening in the heart during the T wave?, Ventricular relaxation and recovery, Which wave on the ECG graph represents atrial depolarization?, P wave

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