Which structure receives impulses from the bundle branches and distributes them through the heart muscle?

Which structure receives impulses from the bundle branches and distributes them through the heart muscle?

• A. SA Node
• B. QRS Complex
• C. Purkinje Fibers
• D. Segment

Answer: (C)

Purkinje fibers form the final part of the heart’s conduction system. They receive the impulse that travels down the bundle branches and then rapidly spread it throughout the ventricular myocardium. This fast distribution ensures the ventricles contract in a coordinated, synchronized way—usually beginning at the apex and moving upward—so the heart pumps efficiently. Understanding why this structure fits: the SA node starts pacing, and the impulse travels through the AV node and His-Purkinje system to reach the ventricles. The QRS complex is a waveform on an ECG that reflects ventricular depolarization, not a physical structure. A segment is not a part of the conduction pathway.

Purkinje fibers form the final part of the heart’s conduction system. They receive the impulse that travels down the bundle branches and then rapidly spread it throughout the ventricular myocardium. This fast distribution ensures the ventricles contract in a coordinated, synchronized way—usually beginning at the apex and moving upward—so the heart pumps efficiently.

Understanding why this structure fits: the SA node starts pacing, and the impulse travels through the AV node and His-Purkinje system to reach the ventricles. The QRS complex is a waveform on an ECG that reflects ventricular depolarization, not a physical structure. A segment is not a part of the conduction pathway.