i know that it isnt the ventricles contracting because the waves themselves arent caused by that, i think it has something to do with the SA node maybe???
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The QRS complex reflects the rapid depolarization of the right and left ventricles. They have a large muscle mass compared to the atria and so the QRS complex usually has a much larger amplitude than the P-wave.
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The heart's electrical system stimulates the contraction of the muscle cells of the four chambers, thereby causing blood to circulate through the chambers in a precise and sequential fashion. The stimulation begins in the sinus node, proceeds through the atria, then moves through the ventricles.
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