Where do the left and right bundle branches originate in the conduction system?

Where do the left and right bundle branches originate in the conduction system?

• A. SA node
• B. AV node
• C. Bundle of His
• D. Purkinje network

Answer: (C)

The left and right bundle branches originate from the bundle of His, the AV bundle that arises from the AV node and travels through the upper part of the interventricular septum. As the impulse moves from the AV node into the bundle of His, it quickly splits into the left and right branches within the septum to depolarize the ventricles. The Purkinje network then arises from these branches to distribute the impulse throughout the ventricular muscle. In this sequence, the SA node sets the pace in the atria, the AV node passes the signal to the His bundle, and the Purkinje fibers are downstream from the branches.

The left and right bundle branches originate from the bundle of His, the AV bundle that arises from the AV node and travels through the upper part of the interventricular septum. As the impulse moves from the AV node into the bundle of His, it quickly splits into the left and right branches within the septum to depolarize the ventricles. The Purkinje network then arises from these branches to distribute the impulse throughout the ventricular muscle. In this sequence, the SA node sets the pace in the atria, the AV node passes the signal to the His bundle, and the Purkinje fibers are downstream from the branches.