What is the normal firing rate of the Bundle of His?

The normal firing rate of the Bundle of His is 40-60 beats per minute (bpm). This specialized conduction tissue is part of the heart's electrical system, along with other components like the sinoatrial (SA) node and the atrioventricular (AV) node. The Bundle of His plays a critical role in transmitting electrical impulses from the AV node to the ventricular myocardium through the ventricles, facilitating coordinated contraction.

While the SA node has a higher rate of 60-100 bpm, which designates it as the primary pacemaker of the heart, the Bundle of His functions as a secondary pacemaker should the SA node fail. Its firing rate is slower, reflecting its role in maintaining rhythm and ensuring that the ventricles contract in response to impulses, thus contributing to proper cardiac function.

Other choices do not accurately reflect the firing rate associated with the Bundle of His. This specificity emphasizes the importance of understanding the hierarchy and normal rates of heart pacemakers in the context of dysrhythmia and overall cardiac health.