Is the heart contracting sequence purkinje fiberssa nodesa nodeav bundle?

The heart's contraction sequence starts with the sinoatrial (SA) node, which initiates the electrical impulse that causes the atria to contract. This impulse then travels to the atrioventricular (AV) node, where it is briefly delayed before moving to the AV bundle (Bundle of His). From there, the impulse spreads through the right and left bundle branches and into the Purkinje fibers, leading to the contraction of the ventricles. Thus, the correct sequence is SA node, AV node, AV bundle, and then Purkinje fibers.