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Portable Network Graphic  |  1988-04-30  |  4.8 KB  |  416x240  |  1-bit (2 colors)
   ocr: sinu-artial node bundle of His - à e atrioventricular E - node Purkinje system The impulse for the activation of the heart muscle myocardium) is normally propagated in a rapid and orderly fashion. This begins with depolarization in the sinu-atrial (SA) node, and then spreads to the atria. ropagation continues in the atrio- ventricular (AV) node where there is a brief delay. The AV node in turn activates the oundle of His which divides into branches and finally into the Purkinje fibers. The impulse for depolar- ization is conducted rapidly to the inner ayer of the ventricle muscle.