<Tr> <Th> FMA </Th> <Td> 9478 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The atrioventricular node, or 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 . The AV node is quite compact (~ 1 x 3 x 5 mm). </P> <P> 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 . The AV node is quite compact (~ 1 x 3 x 5 mm). It is located at the center of Koch's triangle--a triangle enclosed by the septal leaflet of the tricuspid valve, the coronary sinus, and the membranous part of the interatrial septum . </P>

Which component of the cardiac conductions system acts as the main pacemaker