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Heart sounds, specifically the "lub" (S1) and "dub" (S2), correlate with specific phases of the cardiac cycle as reflected in ECG readings. The S1 sound occurs with the closure of the atrioventricular valves, coinciding with the QRS complex, which represents ventricular depolarization. The S2 sound occurs with the closure of the semilunar valves, aligning with the end of the T wave, which represents ventricular repolarization. Thus, heart sounds provide auditory confirmation of the mechanical events depicted in the ECG.

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