Which part of the heart conduction system is stimulated after the Sinoatrial (SA) Node?

After the Sinoatrial (SA) Node, the next part of the heart conduction system that gets stimulated is the Atrioventricular (AV) Node. The SA Node, located in the right atrium, serves as the primary pacemaker of the heart, generating electrical impulses that initiate each heartbeat. Once these impulses travel through the atria and cause them to contract, they reach the AV Node.

The AV Node plays a crucial role in the conduction system by providing a necessary pause between the contraction of the atria and the ventricles. This pause allows the ventricles enough time to fill with blood before they contract. The AV Node then transmits the electrical signal to the Bundle of His, which is situated below it, leading to the excitation of the Purkinje fibers and ultimately the ventricles. This sequenced stimulation is essential for maintaining a coordinated heartbeat and effective blood circulation.

Understanding the heart conduction pathway is vital for recognizing how electrical signals control heart function, which is a foundational concept for those studying medical assistance and cardiology.