BIOS252 Exam 3 Study Guide 2025/2026 – Anatomy
and Physiology II with Lab – Chamberlain University
| 100+ Verified Questions with Correct Answers &
Rationales | A+ Graded
Section: Cardiovascular System
Question 1
What is the primary function of the heart’s left ventricle?
A: Pump blood to the lungs
B: Pump blood to the systemic circulation
C: Receive blood from the pulmonary veins
D: Receive blood from the vena cava
Correct Answer: B
Rationale: Pump blood to the systemic circulation via the aorta is the left ventricle’s role. A is
the right ventricle, C is the left atrium, D is the right atrium.
Question 2
Which structure prevents backflow of blood into the left ventricle?
A: Pulmonary valve
B: Aortic valve
C: Tricuspid valve
D: Mitral valve
Correct Answer: B
Rationale: Aortic valve prevents backflow from the aorta to the left ventricle. A, C, and D serve
other chambers.
Question 3
What is the pacemaker of the heart?
A: Purkinje fibers
B: AV node
C: SA node
D: Bundle of His
Correct Answer: C
Rationale: SA node initiates the heartbeat. A, B, and D conduct impulses but don’t set the pace.
Question 4
Which blood vessel carries deoxygenated blood to the lungs?
A: Pulmonary artery
B: Pulmonary vein
C: Aorta
, D: Coronary artery
Correct Answer: A
Rationale: Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. B
carries oxygenated blood, C is systemic, D supplies the heart.
Question 5
What is the role of the coronary arteries?
A: Supply blood to the lungs
B: Supply blood to the heart muscle
C: Drain blood from the heart
D: Circulate blood to the brain
Correct Answer: B
Rationale: Supply blood to the heart muscle ensures myocardial oxygenation. A, C, and D are
incorrect.
Question 6
Which phase of the cardiac cycle involves ventricular contraction?
A: Diastole
B: Systole
C: Atrial filling
D: Venous return
Correct Answer: B
Rationale: Systole is when ventricles contract to pump blood. A is relaxation, C and D are
unrelated phases.
Question 7
What is the function of the chordae tendineae?
A: Conduct electrical impulses
B: Prevent valve prolapse
C: Pump blood to the aorta
D: Regulate heart rate
Correct Answer: B
Rationale: Prevent valve prolapse ensures mitral/tricuspid valves close properly. A, C, and D
are incorrect.
Question 8
Which layer of the heart wall contains cardiac muscle?
A: Endocardium
B: Myocardium
C: Epicardium
D: Pericardium
Correct Answer: B
Rationale: Myocardium is the muscular layer responsible for contraction. A, C, and D are other
layers.
and Physiology II with Lab – Chamberlain University
| 100+ Verified Questions with Correct Answers &
Rationales | A+ Graded
Section: Cardiovascular System
Question 1
What is the primary function of the heart’s left ventricle?
A: Pump blood to the lungs
B: Pump blood to the systemic circulation
C: Receive blood from the pulmonary veins
D: Receive blood from the vena cava
Correct Answer: B
Rationale: Pump blood to the systemic circulation via the aorta is the left ventricle’s role. A is
the right ventricle, C is the left atrium, D is the right atrium.
Question 2
Which structure prevents backflow of blood into the left ventricle?
A: Pulmonary valve
B: Aortic valve
C: Tricuspid valve
D: Mitral valve
Correct Answer: B
Rationale: Aortic valve prevents backflow from the aorta to the left ventricle. A, C, and D serve
other chambers.
Question 3
What is the pacemaker of the heart?
A: Purkinje fibers
B: AV node
C: SA node
D: Bundle of His
Correct Answer: C
Rationale: SA node initiates the heartbeat. A, B, and D conduct impulses but don’t set the pace.
Question 4
Which blood vessel carries deoxygenated blood to the lungs?
A: Pulmonary artery
B: Pulmonary vein
C: Aorta
, D: Coronary artery
Correct Answer: A
Rationale: Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. B
carries oxygenated blood, C is systemic, D supplies the heart.
Question 5
What is the role of the coronary arteries?
A: Supply blood to the lungs
B: Supply blood to the heart muscle
C: Drain blood from the heart
D: Circulate blood to the brain
Correct Answer: B
Rationale: Supply blood to the heart muscle ensures myocardial oxygenation. A, C, and D are
incorrect.
Question 6
Which phase of the cardiac cycle involves ventricular contraction?
A: Diastole
B: Systole
C: Atrial filling
D: Venous return
Correct Answer: B
Rationale: Systole is when ventricles contract to pump blood. A is relaxation, C and D are
unrelated phases.
Question 7
What is the function of the chordae tendineae?
A: Conduct electrical impulses
B: Prevent valve prolapse
C: Pump blood to the aorta
D: Regulate heart rate
Correct Answer: B
Rationale: Prevent valve prolapse ensures mitral/tricuspid valves close properly. A, C, and D
are incorrect.
Question 8
Which layer of the heart wall contains cardiac muscle?
A: Endocardium
B: Myocardium
C: Epicardium
D: Pericardium
Correct Answer: B
Rationale: Myocardium is the muscular layer responsible for contraction. A, C, and D are other
layers.
