The conduction velocity is maximum in
SA node
AV node
Bundle of his
Purkinje fibres
The velocity of conduction of the excitatory action potential signal along both atrial and ventricular muscle fibers is about 0.3 to 0.5 m/sec, or about 1/250 the velocity in very large nerve fibers and about 1/10 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 m/sec in most pas of the system, which allows reasonably rapid conduction of the excitatory signal to the different pas of the hea. Ref: Guyton and Hall textbook of medical physiology 13th edition. Page: 111
Cardiovascular system