What is the automaticity rate of the Purkinje fibers?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the RCES Exam with flashcards and multiple choice questions, each offering hints and detailed explanations. Ensure your success with a comprehensive study plan!

Multiple Choice

What is the automaticity rate of the Purkinje fibers?

Explanation:
Automaticity is the heart’s ability to generate spontaneous impulses, and different parts of the conduction system have their own intrinsic pacing rates. The Purkinje network, while excellent at conducting impulses rapidly, has the slowest inherent firing rate among the main cardiac pacemakers. Its tissue tends to generate impulses at about 20-40 impulses per minute. That’s why, if the SA node and AV node fail, the Purkinje fibers can take over but produce a much slower ventricular rhythm—roughly 20-40 bpm. In contrast, the SA node paces around 60-100 bpm and the AV node around 40-60 bpm, which is why those ranges don’t fit Purkinje automaticity.

Automaticity is the heart’s ability to generate spontaneous impulses, and different parts of the conduction system have their own intrinsic pacing rates. The Purkinje network, while excellent at conducting impulses rapidly, has the slowest inherent firing rate among the main cardiac pacemakers. Its tissue tends to generate impulses at about 20-40 impulses per minute. That’s why, if the SA node and AV node fail, the Purkinje fibers can take over but produce a much slower ventricular rhythm—roughly 20-40 bpm. In contrast, the SA node paces around 60-100 bpm and the AV node around 40-60 bpm, which is why those ranges don’t fit Purkinje automaticity.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy