What is the function of the Bundle of His?

The Bundle of His plays a critical role in the heart's electrical conduction system by transmitting cardiac impulses from the atrioventricular (AV) node to the ventricles. This structure, also known as the atrioventricular bundle, is essential for coordinated heart contractions, ensuring that the signal moves from the atria, where blood is collected, to the ventricles, which then pump blood out to the lungs and the rest of the body.

The presence of the Bundle of His allows for a delay in the electrical impulse, which gives the atria time to contract and fill the ventricles with blood before the ventricles contract. This sequence is crucial for maintaining effective and synchronized heart function.

The other choices refer to different functions or components within the cardiovascular system that do not correspond to the specific role of the Bundle of His. For instance, heart rate variability is influenced by various factors, including the autonomic nervous system, but not directly through the Bundle of His. Backup pacemaker functions are performed by the Purkinje fibers and other areas of the heart, and while the Bundle of His transmits impulses, it does not act as a backup pacemaker. Lastly, blood pressure regulation is primarily the role of baroreceptors and the autonomic nervous