Cardiology Quiz #15: Conduction System of the Heart

1. A 72-year-old male with a history of ischemic heart disease presents to the emergency department with lightheadedness and palpitations. An ECG reveals a regular rhythm with a rate of 40 beats per minute, no P waves, and a widened QRS complex. Which part of the heart's conduction system is most likely generating the patient's heart rhythm? 

Question 1 of 5

2. A 25-year-old female marathon runner presents for a routine check-up. Her ECG shows a heart rate of 55 bpm with normal morphology. Which part of the heart's conduction system is primarily responsible for setting her resting heart rate? 

Question 2 of 5

3. A 60-year-old man with a history of heart failure is noted to have a prolonged PR interval on his ECG. This finding indicates delayed conduction through which part of the heart's conduction system? 

Question 3 of 5

4. During a physiology class, a student learns that a specific part of the heart's conduction system is responsible for the most rapid conduction velocity, allowing for the simultaneous contraction of the ventricles. Which part of the conduction system is being described? 

Question 4 of 5

5. A 45-year-old woman undergoes electrophysiological testing for palpitations. The study reveals an area of slow conduction followed by rapid conduction within the atria, forming a reentry circuit leading to tachycardia. This type of arrhythmia primarily involves which component of the cardiac electrical system? 

Question 5 of 5


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