Electrical Conduction System includes which structures?

• A. SA node, AV node, Bundle of His, Purkinje fibers
• B. Left Atrium, Right Ventricle, Aorta, Pulmonary Artery
• C. AV Node, SA Node, Purkinje Fibers, Bundle of His
• D. Purkinje Fibers, Chords Tendineae, Papillary Muscles, Septum

Answer: (A)

The electrical conduction system is a specialized network that generates and quickly propagates impulses to coordinate heartbeats. The key components are the sinoatrial (SA) node, which acts as the natural pacemaker; the atrioventricular (AV) node, which delays the impulse to allow ventricular filling; the bundle of His, which transmits the signal from the AV node toward the ventricles; and the Purkinje fibers, which spread the impulse rapidly through the ventricular myocardium to produce synchronized contraction.

Other heart structures like the chambers (left atrium, right ventricle) and major vessels (aorta, pulmonary artery) or structures involved in valve mechanics (chords tendineae, papillary muscles) are not part of the electrical conduction pathway.