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What is the difference between Sinoatrial node and Atrioventricular node?

in Body Fluids and Circulation (Cardiovascular System, Circulatory system) by

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Sinuatrial node is present in right atria. it is called pacemaker because it generates impulese for beating of heart.

Atrioventricular node is present in atrio-ventricular septum. it is called pacesetter because it regulates heart beats 72 beats/min.

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