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Relias Advanced Dysrhythmia Exam 2026-2027 BANK
QUESTIONS WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% CORRECT
ANSWERS A+ GRADED
1. The intrinsic rate of the Sinoatrial (SA) node is best described as
which of the following?
A. 20-40 beats per minute
B. 40-60 beats per minute
C. 60-100 beats per minute
D. 100-150 beats per minute
Answer: C. 60-100 beats per minute. The SA node is the dominant
pacemaker of the heart because it has the fastest intrinsic rate of
automaticity, normally firing at 60-100 times per minute.
2. When the cardiac cell membrane is at rest, the interior of the cell
maintains a negative charge relative to the exterior. This state is known
as what?
A. Depolarization
B. Repolarization
C. Action potential
D. Resting membrane potential
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Answer: D. Resting membrane potential. This state, typically around -90
mV in ventricular myocytes, is maintained by the sodium-potassium
pump and selective membrane permeability, creating a polarized state
ready for stimulation.
3. The term "automaticity" refers to the heart's ability to do which of
the following?
A. Conduct an electrical impulse from cell to cell
B. Contract in response to an electrical stimulus
C. Generate an electrical impulse spontaneously
D. Refractory to any new electrical stimulus
Answer: C. Generate an electrical impulse spontaneously. Automaticity
is a unique property of pacemaker cells (e.g., in the SA node, AV node,
and Purkinje fibers) allowing them to initiate an electrical impulse
without external stimulation.
4. On the standard ECG graph paper, one small box represents what
duration of time?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 0.40 seconds
Answer: A. 0.04 seconds. With a standard paper speed of 25 mm/sec,
each 1 mm small box corresponds to 0.04 seconds. A larger 5 mm box
represents 0.20 seconds.
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5. Which component of the cardiac conduction system is responsible
for the rapid dispersion of the electrical impulse throughout the
ventricular myocardium?
A. Atrioventricular (AV) node
B. Bundle of His
C. Bachmann's bundle
D. Purkinje fibers
Answer: D. Purkinje fibers. These fibers extend from the bundle
branches and rapidly distribute the depolarization wave to the
ventricular muscle cells, ensuring coordinated and efficient ventricular
contraction.
6. On a normal ECG, the P wave represents which electrical event?
A. Ventricular repolarization
B. Atrial depolarization
C. Ventricular depolarization
D. Delay at the AV node
Answer: B. Atrial depolarization. The P wave is the first deflection of the
cardiac cycle and reflects the spread of the electrical impulse from the
SA node through the right and left atria.
7. The normal duration of the PR interval in adults is between what
two values?
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A. 0.04 and 0.10 seconds
B. 0.12 and 0.20 seconds
C. 0.20 and 0.28 seconds
D. 0.28 and 0.36 seconds
Answer: B. 0.12 and 0.20 seconds. The PR interval represents the time
from the onset of atrial depolarization to the onset of ventricular
depolarization, primarily reflecting the physiological delay in the AV
node.
8. A prolonged PR interval greater than 0.20 seconds is the defining
characteristic of which rhythm disturbance?
A. First-degree AV block
B. Type I Second-degree AV block
C. Type II Second-degree AV block
D. Third-degree AV block
Answer: A. First-degree AV block. This is a consistent delay in
conduction through the AV node, manifesting as a PR interval that is
prolonged but constant for every beat, with every P wave followed by a
QRS complex.
9. The QRS complex on the ECG primarily represents which
physiological process?
A. Atrial repolarization
B. Ventricular depolarization
Relias Advanced Dysrhythmia Exam 2026-2027 BANK
QUESTIONS WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% CORRECT
ANSWERS A+ GRADED
1. The intrinsic rate of the Sinoatrial (SA) node is best described as
which of the following?
A. 20-40 beats per minute
B. 40-60 beats per minute
C. 60-100 beats per minute
D. 100-150 beats per minute
Answer: C. 60-100 beats per minute. The SA node is the dominant
pacemaker of the heart because it has the fastest intrinsic rate of
automaticity, normally firing at 60-100 times per minute.
2. When the cardiac cell membrane is at rest, the interior of the cell
maintains a negative charge relative to the exterior. This state is known
as what?
A. Depolarization
B. Repolarization
C. Action potential
D. Resting membrane potential
,2|Page
Answer: D. Resting membrane potential. This state, typically around -90
mV in ventricular myocytes, is maintained by the sodium-potassium
pump and selective membrane permeability, creating a polarized state
ready for stimulation.
3. The term "automaticity" refers to the heart's ability to do which of
the following?
A. Conduct an electrical impulse from cell to cell
B. Contract in response to an electrical stimulus
C. Generate an electrical impulse spontaneously
D. Refractory to any new electrical stimulus
Answer: C. Generate an electrical impulse spontaneously. Automaticity
is a unique property of pacemaker cells (e.g., in the SA node, AV node,
and Purkinje fibers) allowing them to initiate an electrical impulse
without external stimulation.
4. On the standard ECG graph paper, one small box represents what
duration of time?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 0.40 seconds
Answer: A. 0.04 seconds. With a standard paper speed of 25 mm/sec,
each 1 mm small box corresponds to 0.04 seconds. A larger 5 mm box
represents 0.20 seconds.
,3|Page
5. Which component of the cardiac conduction system is responsible
for the rapid dispersion of the electrical impulse throughout the
ventricular myocardium?
A. Atrioventricular (AV) node
B. Bundle of His
C. Bachmann's bundle
D. Purkinje fibers
Answer: D. Purkinje fibers. These fibers extend from the bundle
branches and rapidly distribute the depolarization wave to the
ventricular muscle cells, ensuring coordinated and efficient ventricular
contraction.
6. On a normal ECG, the P wave represents which electrical event?
A. Ventricular repolarization
B. Atrial depolarization
C. Ventricular depolarization
D. Delay at the AV node
Answer: B. Atrial depolarization. The P wave is the first deflection of the
cardiac cycle and reflects the spread of the electrical impulse from the
SA node through the right and left atria.
7. The normal duration of the PR interval in adults is between what
two values?
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A. 0.04 and 0.10 seconds
B. 0.12 and 0.20 seconds
C. 0.20 and 0.28 seconds
D. 0.28 and 0.36 seconds
Answer: B. 0.12 and 0.20 seconds. The PR interval represents the time
from the onset of atrial depolarization to the onset of ventricular
depolarization, primarily reflecting the physiological delay in the AV
node.
8. A prolonged PR interval greater than 0.20 seconds is the defining
characteristic of which rhythm disturbance?
A. First-degree AV block
B. Type I Second-degree AV block
C. Type II Second-degree AV block
D. Third-degree AV block
Answer: A. First-degree AV block. This is a consistent delay in
conduction through the AV node, manifesting as a PR interval that is
prolonged but constant for every beat, with every P wave followed by a
QRS complex.
9. The QRS complex on the ECG primarily represents which
physiological process?
A. Atrial repolarization
B. Ventricular depolarization
