Which of the following correctly traces the electrical impulses that trigger each heartbeat? (a) Ventricles – Pacemaker – AV node – Atria (b) Pacemaker- AV node – Atria – Ventricles (c) Atria – Pacemaker – AV node – Ventricles (d) Pacemaker- Atria – AV node – Ventricles
Option D. The pacemaker initiates an impulse through the atria, which is then conducted to the ventricles by the AV node.
