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Glossary of Physiology Terms -
P wave

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P wave

Definition:
The component of the electrocardiogram (ECG) that corresponds to the depolarization of atrial myocytes. Atrial depolarization precedes atrial contraction.

Related glossary terms/phrases:
QRS complex
T wave




Posted: Friday, January 9, 2015
Last updated: Wednesday, March 12, 2025
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