EKG Exam Prep: 650 Practice Questions with
Detailed Rationales — A Comprehensive Test Bank
for Rhythm Interpretation and 12-Lead Analysis
1|Page
,Chapter Allocation Plan
Chapter
Chapter Title (Topical Framework) Questions Range
Number
1 Cardiac Anatomy and Physiology 37 Q1–Q37
2 Electrophysiology 37 Q38–Q74
3 Lead Morphology and Placement 36 Q75–Q110
Q111–
4 Technical Aspects of the EKG 36
Q146
Q147–
5 Calculating Heart Rate 36
Q182
Q183–
6 How to Interpret a Rhythm Strip 36
Q218
Q219–
7 Rhythms Originating in the Sinus Node 36
Q254
Q255–
8 Rhythms Originating in the Atria 36
Q290
Q291–
9 Rhythms Originating in the AV Junction 36
Q326
Q327–
10 Rhythms Originating in the Ventricles 36
Q362
Q363–
11 AV Blocks 36
Q398
Q399–
12 Rhythm Practice Strips 36
Q434
2|Page
,Chapter
Chapter Title (Topical Framework) Questions Range
Number
Q435–
13 How to Interpret a 12-Lead EKG 36
Q470
Q471–
14 Myocardial Infarction 36
Q506
Q507–
15 12-Lead EKG Practice 36
Q542
Q543–
16 Medications and Electrical Therapy 36
Q578
Q579–
17 Diagnostic Electrocardiography 36
Q614
Putting It All Together: Critical Thinking Q615–
18 36
Scenarios Q650
TOTAL 650 Q1–Q650
Chapter 1: Cardiac Anatomy and Physiology (Q1–Q37)
Q1. Which chamber of the heart receives deoxygenated blood from the superior and inferior vena
cava?
A. Left atrium
B. Right atrium
C. Left ventricle
D. Right ventricle
Correct Answer: B. Right atrium
Rationale: The right atrium receives deoxygenated blood returning from the body via the superior
and inferior vena cava. The left atrium receives oxygenated blood from the pulmonary veins. The
right ventricle pumps blood to the lungs, and the left ventricle pumps blood to the systemic
circulation.
Chapter: 1. Cardiac Anatomy and Physiology
Q2. The valve located between the left atrium and left ventricle is the:
3|Page
, A. Tricuspid valve
B. Pulmonary valve
C. Mitral valve
D. Aortic valve
Correct Answer: C. Mitral valve
Rationale: The mitral (bicuspid) valve separates the left atrium from the left ventricle. The tricuspid
valve separates the right atrium from the right ventricle. The pulmonary and aortic valves are
semilunar valves guarding the exits of the right and left ventricles, respectively.
Chapter: 1. Cardiac Anatomy and Physiology
Q3. Which vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Aorta
D. Superior vena cava
Correct Answer: B. Pulmonary vein
Rationale: The pulmonary veins are unique in that they carry oxygenated blood (unlike most veins)
from the lungs to the left atrium. The pulmonary artery carries deoxygenated blood from the right
ventricle to the lungs. The aorta carries oxygenated blood from the left ventricle to the body, and
the superior vena cava returns deoxygenated blood to the right atrium.
Chapter: 1. Cardiac Anatomy and Physiology
Q4. The thickest layer of the heart wall is the:
A. Endocardium
B. Myocardium
C. Epicardium
D. Pericardium
Correct Answer: B. Myocardium
Rationale: The myocardium is the middle and thickest layer of the heart wall, composed of cardiac
muscle responsible for contraction. The endocardium lines the inner chambers, the epicardium is
the outer layer, and the pericardium is the sac surrounding the heart.
Chapter: 1. Cardiac Anatomy and Physiology
Q5. The coronary arteries originate from the:
A. Pulmonary trunk
B. Aortic root
C. Left ventricle
D. Right atrium
4|Page
Detailed Rationales — A Comprehensive Test Bank
for Rhythm Interpretation and 12-Lead Analysis
1|Page
,Chapter Allocation Plan
Chapter
Chapter Title (Topical Framework) Questions Range
Number
1 Cardiac Anatomy and Physiology 37 Q1–Q37
2 Electrophysiology 37 Q38–Q74
3 Lead Morphology and Placement 36 Q75–Q110
Q111–
4 Technical Aspects of the EKG 36
Q146
Q147–
5 Calculating Heart Rate 36
Q182
Q183–
6 How to Interpret a Rhythm Strip 36
Q218
Q219–
7 Rhythms Originating in the Sinus Node 36
Q254
Q255–
8 Rhythms Originating in the Atria 36
Q290
Q291–
9 Rhythms Originating in the AV Junction 36
Q326
Q327–
10 Rhythms Originating in the Ventricles 36
Q362
Q363–
11 AV Blocks 36
Q398
Q399–
12 Rhythm Practice Strips 36
Q434
2|Page
,Chapter
Chapter Title (Topical Framework) Questions Range
Number
Q435–
13 How to Interpret a 12-Lead EKG 36
Q470
Q471–
14 Myocardial Infarction 36
Q506
Q507–
15 12-Lead EKG Practice 36
Q542
Q543–
16 Medications and Electrical Therapy 36
Q578
Q579–
17 Diagnostic Electrocardiography 36
Q614
Putting It All Together: Critical Thinking Q615–
18 36
Scenarios Q650
TOTAL 650 Q1–Q650
Chapter 1: Cardiac Anatomy and Physiology (Q1–Q37)
Q1. Which chamber of the heart receives deoxygenated blood from the superior and inferior vena
cava?
A. Left atrium
B. Right atrium
C. Left ventricle
D. Right ventricle
Correct Answer: B. Right atrium
Rationale: The right atrium receives deoxygenated blood returning from the body via the superior
and inferior vena cava. The left atrium receives oxygenated blood from the pulmonary veins. The
right ventricle pumps blood to the lungs, and the left ventricle pumps blood to the systemic
circulation.
Chapter: 1. Cardiac Anatomy and Physiology
Q2. The valve located between the left atrium and left ventricle is the:
3|Page
, A. Tricuspid valve
B. Pulmonary valve
C. Mitral valve
D. Aortic valve
Correct Answer: C. Mitral valve
Rationale: The mitral (bicuspid) valve separates the left atrium from the left ventricle. The tricuspid
valve separates the right atrium from the right ventricle. The pulmonary and aortic valves are
semilunar valves guarding the exits of the right and left ventricles, respectively.
Chapter: 1. Cardiac Anatomy and Physiology
Q3. Which vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Aorta
D. Superior vena cava
Correct Answer: B. Pulmonary vein
Rationale: The pulmonary veins are unique in that they carry oxygenated blood (unlike most veins)
from the lungs to the left atrium. The pulmonary artery carries deoxygenated blood from the right
ventricle to the lungs. The aorta carries oxygenated blood from the left ventricle to the body, and
the superior vena cava returns deoxygenated blood to the right atrium.
Chapter: 1. Cardiac Anatomy and Physiology
Q4. The thickest layer of the heart wall is the:
A. Endocardium
B. Myocardium
C. Epicardium
D. Pericardium
Correct Answer: B. Myocardium
Rationale: The myocardium is the middle and thickest layer of the heart wall, composed of cardiac
muscle responsible for contraction. The endocardium lines the inner chambers, the epicardium is
the outer layer, and the pericardium is the sac surrounding the heart.
Chapter: 1. Cardiac Anatomy and Physiology
Q5. The coronary arteries originate from the:
A. Pulmonary trunk
B. Aortic root
C. Left ventricle
D. Right atrium
4|Page
