1
NURS 5354 EKG ACTUAL 2025/2026
QUESTIONS AND 100% CORRECT
ANSWERS
heart 4 chambers - (ANSWER)Right and Left atrium & Right and Left ventricle
Perfusion to the various chambers of the heart is via - (ANSWER)RCA & Left main
descends into LAD (left anterior descending artery)
RCA supplies blood to - (ANSWER)RA, RV, SA (sinoatrial node) & AV
(atrioventricular node)
LAD supplies blood to - (ANSWER)L front side of the heart
L circumflex artery supplies - (ANSWER)to left outer side as well as posterior side
of the heart
Both the LAD & RCA supply blood to - (ANSWER)the septum
Cardiac contraction happens when - (ANSWER)depolarization of the heart
3 heart components which spread electrical currents - (ANSWER)cardiac
pacemaker cells, specialized conduction tissue, & the heart muscle
,2
Depolarization originates in - (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 - (ANSWER)activate ventricular muscle
Only electrical conduction between the atria and ventricles (healthy heart) -
(ANSWER)AV node
12-lead ECG - (ANSWER)electric potentials generated by the heart and captures
the electrical component (depolarization & repolarization)
12 lead ECG electrical activity measured from - (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 - (ANSWER)I, II, III, aVR, aVL, & aVF
Horizontal plane provides for leads - (ANSWER)V1, V2, V3, V4, V5, & V6
Lateral leads are - (ANSWER)Lead I, aVL, V5, and V6
, 3
Lateral leads represent - (ANSWER)Left circumflex artery
Inferior leads are - (ANSWER)Lead II, III, and aVF
Inferior leads represent - (ANSWER)RCA
Anteroseptal leads - (ANSWER)V1, V2, V3, and V4
Anteroseptal leads represent - (ANSWER)LAD
Septal leads - (ANSWER)V1 and V2. Represents LAD
Anterior leads - (ANSWER)V3 and V4. Represents LAD
PQRST complex represents - (ANSWER)depolarization and repolarization of the
heart
ECG box horizontal axis measures - (ANSWER)Speed
Vertical axis measures - (ANSWER)Amplitude of a given wave or deflection
One small square within a large box is - (ANSWER)0.04 seconds and 0.1mV
NURS 5354 EKG ACTUAL 2025/2026
QUESTIONS AND 100% CORRECT
ANSWERS
heart 4 chambers - (ANSWER)Right and Left atrium & Right and Left ventricle
Perfusion to the various chambers of the heart is via - (ANSWER)RCA & Left main
descends into LAD (left anterior descending artery)
RCA supplies blood to - (ANSWER)RA, RV, SA (sinoatrial node) & AV
(atrioventricular node)
LAD supplies blood to - (ANSWER)L front side of the heart
L circumflex artery supplies - (ANSWER)to left outer side as well as posterior side
of the heart
Both the LAD & RCA supply blood to - (ANSWER)the septum
Cardiac contraction happens when - (ANSWER)depolarization of the heart
3 heart components which spread electrical currents - (ANSWER)cardiac
pacemaker cells, specialized conduction tissue, & the heart muscle
,2
Depolarization originates in - (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 - (ANSWER)activate ventricular muscle
Only electrical conduction between the atria and ventricles (healthy heart) -
(ANSWER)AV node
12-lead ECG - (ANSWER)electric potentials generated by the heart and captures
the electrical component (depolarization & repolarization)
12 lead ECG electrical activity measured from - (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 - (ANSWER)I, II, III, aVR, aVL, & aVF
Horizontal plane provides for leads - (ANSWER)V1, V2, V3, V4, V5, & V6
Lateral leads are - (ANSWER)Lead I, aVL, V5, and V6
, 3
Lateral leads represent - (ANSWER)Left circumflex artery
Inferior leads are - (ANSWER)Lead II, III, and aVF
Inferior leads represent - (ANSWER)RCA
Anteroseptal leads - (ANSWER)V1, V2, V3, and V4
Anteroseptal leads represent - (ANSWER)LAD
Septal leads - (ANSWER)V1 and V2. Represents LAD
Anterior leads - (ANSWER)V3 and V4. Represents LAD
PQRST complex represents - (ANSWER)depolarization and repolarization of the
heart
ECG box horizontal axis measures - (ANSWER)Speed
Vertical axis measures - (ANSWER)Amplitude of a given wave or deflection
One small square within a large box is - (ANSWER)0.04 seconds and 0.1mV
