AVN is located in the right septum of the heart. It is composed of cardiac muscle. This is called a protected pacemaker. Because if the SAN fails to generate an electrical signal, it generates it. It receives impulses from the SAN and transmits them to the bundle of His. It takes 0.03 seconds for the impulse from the SAN to reach the AVN. But the AVN has a delay of 0.09 seconds in the arrival of the stimulus. This is called AV Nodal Delay. It then takes another 0.04 seconds for the AVN to travel from the thalamus to the ventricle muscle. That is, the impulse from the AVN takes a total of (0.03+0.09+0.04) 0.16 seconds to reach the ventricle muscle.