alleryStart learning →Which fibers finally spread the impulse to the myocardial contractile cells of the ventricles?
AInternodal pathways
BChordae tendineae
CTrabecular fibers
DPurkinje fibers
Answer & Solution
Correct answer: D. Purkinje fibers
1. The bundle branches descend to the apex and connect with the Purkinje fibers.
2. The Purkinje fibers are additional myocardial conductive fibers that spread the impulse to the contractile cells.
3. They have a fast inherent conduction rate, reaching the whole ventricle quickly.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 19 "The Cardiovascular System: The Heart", section 19.2 Cardiac Muscle and Electrical Activity_
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