Relias Dysrhythmia Basic B Test Newest 2026 | Basic B Dysrhythmia Relias Test

Relias Dysrhythmia Basic B Test Newest
2026 | Basic B Dysrhythmia Relias Test

The electrical impulse normally originates from which structure of the
heart?




A) AV node






B) Bundle of His





C) SA node





D) Purkinje fibers
Answer: C) SA node
Rationale: The sinoatrial (SA) node is the primary pacemaker of the heart,
located in the right atrium near the superior vena cava .



What is the normal intrinsic firing rate of the SA node?




A) 20-40 bpm






B) 40-60 bpm


,


C) 60-100 bpm





D) 100-150 bpm
Answer: C) 60-100 bpm
Rationale: The SA node normally fires at 60-100 beats per minute .



What is the normal intrinsic firing rate of the AV node (junctional tissue)?




A) 20-40 bpm






B) 40-60 bpm





C) 60-100 bpm





D) 100-150 bpm
Answer: B) 40-60 bpm
Rationale: The AV node serves as the secondary pacemaker with an
intrinsic firing rate of 40-60 bpm. It takes over if the SA node fails .



What is the normal intrinsic firing rate of the Purkinje fibers?




A) 20-40 bpm

, 




B) 40-60 bpm





C) 60-100 bpm





D) 100-150 bpm
Answer: A) 20-40 bpm
Rationale: Purkinje fibers serve as the tertiary pacemaker at 20-40 bpm .



The T wave on an ECG represents:




A) Atrial depolarization






B) Ventricular depolarization





C) Atrial repolarization





D) Ventricular repolarization
Answer: D) Ventricular repolarization
Rationale: The T wave corresponds to the recovery phase of the ventricles
as they return to their resting electrical state after depolarization .
