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Definition of atrioventricular. : of, relating to, or located between an atrium and ventricle of the heart.
The atrioventricular (AV) node is a part of the electrical conduction system of the heart that coordinates the top of the heart . It electrically connects the right atrium and right ventricle . The AV node lies at the lower back section of the interatrial septum near the opening of the coronary sinus , which conducts the normal electrical impulse from the atria to the ventricles.