NURS 5354 EKG Exam 2026 Questions
and Answers
heart 4 chambers - Correct answer-Right and Left atrium & Right and Left
ventricle
Perfusion to the various chambers of the heart is via - Correct answer-RCA & Left
main descends into LAD (left anterior descending artery)
RCA supplies blood to - Correct answer-RA, RV, SA (sinoatrial node) & AV
(atrioventricular node)
LAD supplies blood to - Correct answer-L front side of the heart
L circumflex artery supplies - Correct answer-to left outer side as well as posterior
side of the heart
Both the LAD & RCA supply blood to - Correct answer-the septum
Cardiac contraction happens when - Correct answer-depolarization of the heart
3 heart components which spread electrical currents - Correct answer-cardiac
pacemaker cells, specialized conduction tissue, & the heart muscle
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,Depolarization originates in - Correct answer-SA node & spreads through the R&L
atrium which is followed by atrial contraction. The impulse travels to AV node
emerges and transmits through bundle of His, then L&R bundle branches, and
finally through the Purkinje fibers which facilitates activation of the ventricular
muscle
Purkinje Fibers - Correct answer-activate ventricular muscle
Only electrical conduction between the atria and ventricles (healthy heart) -
Correct answer-AV node
12-lead ECG - Correct answer-electric potentials generated by the heart and
captures the electrical component (depolarization & repolarization)
12 lead ECG electrical activity measured from - Correct answer-12 perspectives
(leads) of the heart can be evaluated through 2 electrical planes (vertical and
horizontal). 4 extremity or limb leads and 6 precordial or chest leads
Vertical plane provides info for leads - Correct answer-I, II, III, aVR, aVL, & aVF
Horizontal plane provides for leads - Correct answer-V1, V2, V3, V4, V5, & V6
Lateral leads are - Correct answer-Lead I, aVL, V5, and V6
Lateral leads represent - Correct answer-Left circumflex artery
Inferior leads are - Correct answer-Lead II, III, and aVF
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, Inferior leads represent - Correct answer-RCA
Anteroseptal leads - Correct answer-V1, V2, V3, and V4
Anteroseptal leads represent - Correct answer-LAD
Septal leads - Correct answer-V1 and V2. Represents LAD
Anterior leads - Correct answer-V3 and V4. Represents LAD
PQRST complex represents - Correct answer-depolarization and repolarization of
the heart
ECG box horizontal axis measures - Correct answer-Speed
Vertical axis measures - Correct answer-Amplitude of a given wave or deflection
One small square within a large box is - Correct answer-0.04 seconds and 0.1mV
A large square which contains five boxes across and five boxes down is - Correct
answer-.2 sec and 0.5mV
Speed equates to - Correct answer-the # of complexes on a ECG strip = HR
Isoelectric line - Correct answer-designates the flat part of the diagram between the
P wave and T wave & significant variations in positive and negative deflections
can correlate with certain diseases or disorders
Appear above the isoelectric line - Correct answer-Positive deflections
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and Answers
heart 4 chambers - Correct answer-Right and Left atrium & Right and Left
ventricle
Perfusion to the various chambers of the heart is via - Correct answer-RCA & Left
main descends into LAD (left anterior descending artery)
RCA supplies blood to - Correct answer-RA, RV, SA (sinoatrial node) & AV
(atrioventricular node)
LAD supplies blood to - Correct answer-L front side of the heart
L circumflex artery supplies - Correct answer-to left outer side as well as posterior
side of the heart
Both the LAD & RCA supply blood to - Correct answer-the septum
Cardiac contraction happens when - Correct answer-depolarization of the heart
3 heart components which spread electrical currents - Correct answer-cardiac
pacemaker cells, specialized conduction tissue, & the heart muscle
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Depolarization originates in - Correct answer-SA node & spreads through the R&L
atrium which is followed by atrial contraction. The impulse travels to AV node
emerges and transmits through bundle of His, then L&R bundle branches, and
finally through the Purkinje fibers which facilitates activation of the ventricular
muscle
Purkinje Fibers - Correct answer-activate ventricular muscle
Only electrical conduction between the atria and ventricles (healthy heart) -
Correct answer-AV node
12-lead ECG - Correct answer-electric potentials generated by the heart and
captures the electrical component (depolarization & repolarization)
12 lead ECG electrical activity measured from - Correct answer-12 perspectives
(leads) of the heart can be evaluated through 2 electrical planes (vertical and
horizontal). 4 extremity or limb leads and 6 precordial or chest leads
Vertical plane provides info for leads - Correct answer-I, II, III, aVR, aVL, & aVF
Horizontal plane provides for leads - Correct answer-V1, V2, V3, V4, V5, & V6
Lateral leads are - Correct answer-Lead I, aVL, V5, and V6
Lateral leads represent - Correct answer-Left circumflex artery
Inferior leads are - Correct answer-Lead II, III, and aVF
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, Inferior leads represent - Correct answer-RCA
Anteroseptal leads - Correct answer-V1, V2, V3, and V4
Anteroseptal leads represent - Correct answer-LAD
Septal leads - Correct answer-V1 and V2. Represents LAD
Anterior leads - Correct answer-V3 and V4. Represents LAD
PQRST complex represents - Correct answer-depolarization and repolarization of
the heart
ECG box horizontal axis measures - Correct answer-Speed
Vertical axis measures - Correct answer-Amplitude of a given wave or deflection
One small square within a large box is - Correct answer-0.04 seconds and 0.1mV
A large square which contains five boxes across and five boxes down is - Correct
answer-.2 sec and 0.5mV
Speed equates to - Correct answer-the # of complexes on a ECG strip = HR
Isoelectric line - Correct answer-designates the flat part of the diagram between the
P wave and T wave & significant variations in positive and negative deflections
can correlate with certain diseases or disorders
Appear above the isoelectric line - Correct answer-Positive deflections
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