Question

Specifically, what part of the intrinsic conduction system stimulates the atrioventricular (AV) node to conduct impulses to the atrioventricular bundle? Pathways of action potential propagation during a cardiac cycle. Specifically, what part of the intrinsic conduction system stimulates the atrioventricular (AV) node to conduct impulses to the atrioventricular bundle? Pathways of action potential propagation during a cardiac cycle. interventricular septum bundle branches sinoatrial (SA) node subendocardial conducting network (Purkinje fibers)

Answer 1

Pathway of action potential generated during a cardiac cycle follows the given path-

Action potential generated at sinoatrial node -->

From SAN reaches atrioventricular node via three tracts- anterior internodal, middle internodal and posterior internodal tract. --> from AVN reaches to bundle of his which divides into left bundle branch and right bundle branch in the intermuscular septum --> impulse reaches to anterior fascicle and posterior fascicle from right and left bundle branch respectively reachibg to the purkinje fibres .

In the intrinsic system, it is sinoatrial node whose stimulation amd generation of impulse causes stimulation of atrioventricular node via atrial muscle fibres which are modifies and they are called internodal atrial pathways.