Conduction of the Heart (4)

Ventricles
As the electrical impulse leaves the AV node, it passes into the bundle of His and then

down the bundle branches simultaneously. The first section of the ventricles to begin

depolarization is the mid portion of the interventricular septum from the left side, giving

rise to the normal Qwave on the 12-lead ECG. The walls of the left and right ventricles

are depolarized simultaneously. The speed of conduction through the ventricular Purkinje

network is rapid, about 4000 mm/s. Conduction in the ventricular muscle itself is considerably siowerabout400mm/s)