The p wave on an electrocardiogram (ecg) represents the depolarization of cells in the sinoatrial (SA) node.
What is sinoatrial node?
The sinoatrial node is close to the opening of the superior vena cava. This bundle of nerve tissue propagates electrical impulses and therefore governs sinus rhythm from minute to minute.
Electrocardiogram is a test, it is possible to detect the rhythm of the heart and the number of beats per minute.
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