Primary pacemaker
Interventricular septum
Delays impulse from the SA Node because it contains non-conductive tissue. Relays it to the bundle of His
AV Node
Ventricular myocardium
Intrinsic rate 20-40 BPM
Upper interventricular septum
Relay impulse to ventricular myocardium
Upper Right Atrial Wall
Relays impulse to Purkinje Fibers
60-100 BPM
40-60 BPM
SA NODE
Bottom of the right atrium
Relays impulse to right and left bundle branches
