av node

Science Dictionary
atrioventricular node   (ā'trē-ō-věn-trĭk'yə-lər)  Pronunciation Key 
A small area of specialized cardiac muscle cells that conducts impulses from the sinoatrial node to the ventricles and initiates the contraction of the ventricles. It is located in the right atrium.
American Heritage
Science Dictionary
AV node   (ā'vē')  Pronunciation Key 
See atrioventricular node.
The American Heritage® Science Dictionary
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