Medical Definition of atrioventricular node
: a small mass of tissue that is situated in the wall of the right atrium adjacent to the septum between the atria, passes impulses received from the sinoatrial node to the ventricles by way of the bundle of His, and in some pathological states replaces the sinoatrial node as pacemaker of the heart
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Dictionary: Definition of "atrioventricular node" Britannica.com: Encyclopedia article about "atrioventricular node"
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