CVN Cardiac-Vascular Nursing Exam Prep | Complete Practice
Questions, Correct Answers & Detailed Rationales 2026/2027
Question 1
Which layer of the heart wall is primarily responsible for myocardial
contraction and consists of striated muscle fibers?
• A. Epicardium
• B. Myocardium
• C. Endocardium
• D. Pericardium
Correct Answer: B. Myocardium
Detailed Rationale: The myocardium is the thick, middle layer of the
heart wall composed of specialized cardiac muscle tissue that provides
the contractile force necessary to pump blood throughout the body.
Question 2
What is the normal physiological range for cardiac output in a resting
adult?
• A. 1.0 to 3.0 L/min
• B. 4.0 to 8.0 L/min
• C. 9.0 to 12.0 L/min
• D. 13.0 to 15.0 L/min
Correct Answer: B. 4.0 to 8.0 L/min
,Detailed Rationale: Cardiac output—the volume of blood pumped by
the heart per minute—typically ranges from 4.0 to 8.0 L/min in a
healthy resting adult, varying with body size and metabolic demand.
Question 3
During which phase of the cardiac cycle do the semilunar (aortic and
pulmonic) valves open?
• A. Isovolumetric relaxation
• B. Ventricular filling
• C. Ventricular systole (when ventricular pressure exceeds aortic
and pulmonary artery pressure)
• D. Atrial diastole
Correct Answer: C. Ventricular systole (when ventricular pressure
exceeds aortic and pulmonary artery pressure)
Detailed Rationale: As ventricles contract and intraventricular pressure
rises above the diastolic pressures in the aorta and pulmonary artery,
the semilunar valves are forced open to allow blood ejection.
Question 4
Which specialized conduction pathway transmits electrical impulses
directly from the AV node through the interventricular septum?
• A. Sinoatrial node
• B. Bundle of His (Atrioventricular bundle)
• C. Bachmann's bundle
• D. Internodal pathways
,Correct Answer: B. Bundle of His (Atrioventricular bundle)
Detailed Rationale: The Bundle of His originates at the AV node,
penetrates the fibrous skeleton, and divides into right and left bundle
branches to rapidly conduct impulses down the interventricular
septum.
Question 5
What is the primary physiological effect of parasympathetic vagal
stimulation on the heart?
• A. Increased heart rate (positive chronotropy)
• B. Decreased heart rate and slowed AV nodal conduction (negative
chronotropy and dromotropy)
• C. Enhanced myocardial contractility (positive inotropy)
• D. Vasoconstriction of coronary arteries
Correct Answer: B. Decreased heart rate and slowed AV nodal
conduction (negative chronotropy and dromotropy)
Detailed Rationale: Vagal nerve stimulation releases acetylcholine,
which acts on muscarinic receptors to hyperpolarize pacemaker cells,
reducing heart rate and slowing conduction through the AV node.
Question 6
According to the Frank-Starling law of the heart, an increase in
ventricular end-diastolic volume results in which of the following?
• A. Decreased stroke volume due to fiber fatigue
• B. Increased stroke volume due to optimal myocardial stretch and
stronger contraction
, • C. Immediate cardiac arrest
• D. Unchanged stroke volume regardless of filling
Correct Answer: B. Increased stroke volume due to optimal myocardial
stretch and stronger contraction
Detailed Rationale: The Frank-Starling mechanism states that greater
initial stretching of cardiac muscle fibers (preload) leads to an increased
force of contraction and a higher stroke volume, matching output to
venous return.
Question 7
What does the term "afterload" refer to in cardiovascular
hemodynamics?
• A. The volume of blood in the ventricle at the end of diastole
• B. The resistance or impedance that the ventricle must overcome
to eject blood during systole
• C. The speed of electrical impulse conduction through the Purkinje
fibers
• D. The baseline heart rate at rest
Correct Answer: B. The resistance or impedance that the ventricle must
overcome to eject blood during systole
Detailed Rationale: Afterload represents the load against which the
heart must contract to eject blood, largely determined by systemic
vascular resistance for the left ventricle and pulmonary vascular
resistance for the right.
Question 8
Questions, Correct Answers & Detailed Rationales 2026/2027
Question 1
Which layer of the heart wall is primarily responsible for myocardial
contraction and consists of striated muscle fibers?
• A. Epicardium
• B. Myocardium
• C. Endocardium
• D. Pericardium
Correct Answer: B. Myocardium
Detailed Rationale: The myocardium is the thick, middle layer of the
heart wall composed of specialized cardiac muscle tissue that provides
the contractile force necessary to pump blood throughout the body.
Question 2
What is the normal physiological range for cardiac output in a resting
adult?
• A. 1.0 to 3.0 L/min
• B. 4.0 to 8.0 L/min
• C. 9.0 to 12.0 L/min
• D. 13.0 to 15.0 L/min
Correct Answer: B. 4.0 to 8.0 L/min
,Detailed Rationale: Cardiac output—the volume of blood pumped by
the heart per minute—typically ranges from 4.0 to 8.0 L/min in a
healthy resting adult, varying with body size and metabolic demand.
Question 3
During which phase of the cardiac cycle do the semilunar (aortic and
pulmonic) valves open?
• A. Isovolumetric relaxation
• B. Ventricular filling
• C. Ventricular systole (when ventricular pressure exceeds aortic
and pulmonary artery pressure)
• D. Atrial diastole
Correct Answer: C. Ventricular systole (when ventricular pressure
exceeds aortic and pulmonary artery pressure)
Detailed Rationale: As ventricles contract and intraventricular pressure
rises above the diastolic pressures in the aorta and pulmonary artery,
the semilunar valves are forced open to allow blood ejection.
Question 4
Which specialized conduction pathway transmits electrical impulses
directly from the AV node through the interventricular septum?
• A. Sinoatrial node
• B. Bundle of His (Atrioventricular bundle)
• C. Bachmann's bundle
• D. Internodal pathways
,Correct Answer: B. Bundle of His (Atrioventricular bundle)
Detailed Rationale: The Bundle of His originates at the AV node,
penetrates the fibrous skeleton, and divides into right and left bundle
branches to rapidly conduct impulses down the interventricular
septum.
Question 5
What is the primary physiological effect of parasympathetic vagal
stimulation on the heart?
• A. Increased heart rate (positive chronotropy)
• B. Decreased heart rate and slowed AV nodal conduction (negative
chronotropy and dromotropy)
• C. Enhanced myocardial contractility (positive inotropy)
• D. Vasoconstriction of coronary arteries
Correct Answer: B. Decreased heart rate and slowed AV nodal
conduction (negative chronotropy and dromotropy)
Detailed Rationale: Vagal nerve stimulation releases acetylcholine,
which acts on muscarinic receptors to hyperpolarize pacemaker cells,
reducing heart rate and slowing conduction through the AV node.
Question 6
According to the Frank-Starling law of the heart, an increase in
ventricular end-diastolic volume results in which of the following?
• A. Decreased stroke volume due to fiber fatigue
• B. Increased stroke volume due to optimal myocardial stretch and
stronger contraction
, • C. Immediate cardiac arrest
• D. Unchanged stroke volume regardless of filling
Correct Answer: B. Increased stroke volume due to optimal myocardial
stretch and stronger contraction
Detailed Rationale: The Frank-Starling mechanism states that greater
initial stretching of cardiac muscle fibers (preload) leads to an increased
force of contraction and a higher stroke volume, matching output to
venous return.
Question 7
What does the term "afterload" refer to in cardiovascular
hemodynamics?
• A. The volume of blood in the ventricle at the end of diastole
• B. The resistance or impedance that the ventricle must overcome
to eject blood during systole
• C. The speed of electrical impulse conduction through the Purkinje
fibers
• D. The baseline heart rate at rest
Correct Answer: B. The resistance or impedance that the ventricle must
overcome to eject blood during systole
Detailed Rationale: Afterload represents the load against which the
heart must contract to eject blood, largely determined by systemic
vascular resistance for the left ventricle and pulmonary vascular
resistance for the right.
Question 8
