<prompt> Maximum velocity of conduction is seen in ?SA nodeAV nodeBundle of HISPurkinje fibers  <response>: Purkinje fibers REF: Guytons physiology 22nd edition page 105 Velocity of Signal Conduction in Cardiac Muscle: The velocity of conduction of the excitatory action potential signal along both atrial and ventricular muscle fibers is about 0.3 to 0.5 msec, or about 1250 the velocity in very large nerve fibers and about 110 the velocity in skeletal muscle fibers. The velocity of conduction in the specialized hea conductive system___ in the Purkinje fibers__ is as great as 4 msec in most pas of the system, which allows reasonably rapid conduction of the excitatory signal to the different pas of the hea 