The bundle branches transmit impulses to which tissue?

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

Answer: (A)

The main idea is how the heart’s electrical signal reaches the heart muscle of the ventricles in a way that makes them contract together. After the impulse moves from the AV node and travels down the interventricular septum via the bundle branches, it ends in a network of Purkinje fibers. These fibers are specialized conductors that spread the impulse rapidly and uniformly to the ventricular myocardium, ensuring a coordinated, synchronous contraction of the ventricles.

The Purkinje system is the final relay in the conducting pathway, distributing the impulse to all ventricular cells. The other structures work earlier in the pathway: the AV node introduces a brief delay to allow filling, the Bundle of His is the main conduit to the ventricles, and the SA node is the natural pacemaker that starts the signal.