PATHOLOGY

Detailed explanation-1: -The sinuatrial and atrioventricular nodes are connected through the internodal conduction pathways providing fast action potentials transmission. Located in the interatrial septum, the AV node conducts electrical impulses from the SA node to the heart ventricles.

Detailed explanation-2: -The main parts of the system are the SA node, AV node, bundle of HIS, bundle branches, and Purkinje fibers. Let’s follow a signal through the contraction process.

Detailed explanation-3: -The conducting system of the heart consists of cardiac muscle cells and conducting fibers (not nervous tissue) that are specialized for initiating impulses and conducting them rapidly through the heart (see the image below). They initiate the normal cardiac cycle and coordinate the contractions of cardiac chambers.