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what causes the QRS complex on an EKG?
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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- HazelLv 41 decade agoFavorite Answer
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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