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Paramedic A&P Practice Exam

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Which component of the conduction system ensures ventricular contraction by distributing impulses to the ventricles?
Correct Answer:
Purkinje fibers
Explanation:
The final spread of the impulse to the ventricles is handled by a specialized network of fast-conducting fibers that run through the ventricular walls. These Purkinje fibers distribute the electrical signal quickly and uniformly to both the right and left ventricles, ensuring they contract in a coordinated, synchronized manner. This rapid ventricular activation is essential for efficient pumping. The other parts of the conduction system have different roles: the sinoatrial node sets the heart’s pace in the atria, the atrioventricular node provides a delay to allow ventricular filling, and the bundle of His transmits the impulse from the AV node toward the ventricles. The actual distribution to the ventricular myocardium is accomplished by the Purkinje fibers.

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