Human Anatomy & Physiology II (BIOL 252) Module 2
Exam Questions with complete updated Answers 2026 -
2027
Master your BIOL 252 Human Anatomy & Physiology II Module 2 Exam with this comprehensive study guide.
Features 200 rigorous, high-yield multiple-choice questions complete with correct answers and detailed
italicized rationales. Perfect for mastering the cardiovascular system, intrinsic conduction pathways, heart wall
layers, and valve mechanics. Review efficiently, test your understanding, and ace your Portage / Geneva College
nursing and allied health exam!
1. Which layer of the heart wall is responsible for the actual pumping mechanism and contraction
of the heart?
A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium
Answer: B) Myocardium
Rationale: The myocardium is the middle, thick layer of the heart wall composed entirely of cardiac
muscle cells. It is the layer directly responsible for the forceful contraction and pumping action of the
heart. The epicardium is the outer protective layer, and the endocardium is the smooth inner endothelial
lining.
2. What is the correct sequence of electrical current flow through the intrinsic conduction system
of the heart?
A) AV Node -> SA Node -> Bundle of His -> Purkinje Fibers
B) SA Node -> AV Node -> Bundle of His -> Bundle Branches -> Purkinje Fibers
C) SA Node -> Bundle Branches -> AV Node -> Purkinje Fibers
D) AV Node -> Bundle of His -> Purkinje Fibers -> SA Node
Answer: B) SA Node -> AV Node -> Bundle of His -> Bundle Branches -> Purkinje Fibers
Rationale: The intrinsic conduction system begins at the sinoatrial (SA) node (the pacemaker). The signal
then travels to the atrioventricular (AV) node, where it is briefly delayed. From there, it passes into the
Bundle of His (AV bundle), splits into the right and left bundle branches within the interventricular
septum, and finally spreads through the Purkinje fibers to trigger ventricular contraction.
3. Which anatomical structures anchor the atrioventricular valve cusps to prevent them from
everting into the atria during ventricular contraction?
A) Fossa ovalis
B) Pectinate muscles
C) Chordae tendineae and papillary muscles
D) Trabeculae carneae
Answer: C) Chordae tendineae and papillary muscles
Rationale: Chordae tendineae (the "heart strings") connect the cusps of the tricuspid and bicuspid
,(mitral) valves to the papillary muscles projecting from the ventricular walls. When the ventricles
contract, the papillary muscles pull on these strings, preventing the valves from blowing inside-out
(everting) into the atria.
4. Which valve prevents the backflow of oxygenated blood from the aorta into the left ventricle?
A) Tricuspid valve
B) Mitral valve
C) Pulmonary semilunar valve
D) Aortic semilunar valve
Answer: D) Aortic semilunar valve
Rationale: The aortic semilunar valve sits between the left ventricle and the aorta. It opens to allow
oxygenated blood to enter systemic circulation and snaps shut during ventricular relaxation to prevent
that blood from leaking backward into the left ventricle.
5. What is the primary function of the gap junctions located within the intercalated discs of cardiac
muscle fibers?
A) Securing the cells mechanically to prevent tearing
B) Allowing rapid passage of ions to electrically couple adjacent cells
C) Preventing calcium ions from entering the cytoplasm
D) Anchoring the thick myosin filaments to the Z discs
Answer: B) Allowing rapid passage of ions to electrically couple adjacent cells
Rationale: Gap junctions are microscopic channels within the intercalated discs that allow ions to flow
freely and instantly from one cardiac cell to the next. This electrical coupling ensures that the entire
chamber contracts as a single, coordinated unit (a functional syncytium). Desmosomes, not gap
junctions, provide the mechanical strength to prevent tearing.
6. Which blood vessel carries deoxygenated blood away from the right ventricle toward the lungs?
A) Pulmonary trunk
B) Aorta
C) Superior vena cava
D) Pulmonary veins
Answer: A) Pulmonary trunk
Rationale: The right ventricle pumps oxygen-poor blood through the pulmonary semilunar valve into the
pulmonary trunk, which branches into pulmonary arteries heading to the lungs. Pulmonary veins carry
oxygenated blood back to the heart, while the aorta carries oxygenated blood to the body.
7. What thin, visceral layer is closely applied to the outer surface of the myocardium and forms the
inner layer of the pericardial sac?
A) Fibrous pericardium
B) Parietal pericardium
C) Epicardium
D) Endocardium
Answer: C) Epicardium
Rationale: The epicardium is structurally identical to the visceral layer of the serous pericardium. It lines
,the outer surface of the heart muscle, while the parietal pericardium lines the outer cavity wall and the
fibrous pericardium forms the tough external sac.
8. Which structure represents the shallow depression in the interatrial septum that is a remnant of
an opening in the fetal heart?
A) Foramen magnum
B) Fossa ovalis
C) Ligamentum arteriosum
D) Ductus arteriosus
Answer: B) Fossa ovalis
Rationale: The fossa ovalis is the adult remnant of the fetal foramen ovale, an opening that allowed
blood to bypass the non-functional fetal lungs by flowing directly from the right atrium to the left atrium.
9. Which specific chamber has the thickest myocardium because it must generate enough pressure
to pump blood throughout the entire systemic circulation?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: D) Left ventricle
Rationale: The left ventricle features walls roughly three times thicker than the right ventricle. It must
overcome high resistance to force blood through the entire body, whereas the right ventricle only pumps
short distances to the low-resistance pulmonary circuit.
10. What electrical event on an electrocardiogram (ECG) represents the depolarization of the
ventricles?
A) P wave
B) QRS complex
C) T wave
D) PR interval
Answer: B) QRS complex
Rationale: The QRS complex represents ventricular depolarization, which spreads rapidly through the
ventricular walls and precedes ventricular contraction. The P wave represents atrial depolarization, and
the T wave signifies ventricular repolarization.
11. Why does the electrical impulse experience a brief delay at the atrioventricular (AV) node?
A) To allow the ventricles to finish repolarizing
B) To permit the atria to fully contract and empty blood into the ventricles
C) To allow the semilunar valves time to close safely
D) To prevent the SA node from firing too rapidly
Answer: B) To permit the atria to fully contract and empty blood into the ventricles
Rationale: The roughly 0.1-second delay at the AV node ensures that the atria complete their contraction
(atrial systole) and fully top off ventricular volume before the ventricles are stimulated to contract.
, 12. During which phase of the cardiac cycle do all four heart valves remain closed while ventricular
pressure rises without any changes in volume?
A) Isovolumetric contraction phase
B) Isovolumetric relaxation phase
C) Ventricular ejection phase
D) Passive ventricular filling phase
Answer: A) Isovolumetric contraction phase
Rationale: Isovolumetric contraction occurs at the beginning of ventricular systole. The AV valves snap
shut due to rising pressure, but the pressure is not yet high enough to push open the semilunar valves.
Volume remains constant as pressure spikes.
13. What cardiac tissue modification holds adjacent cardiac muscle cells tightly together against
mechanical stress during contractions?
A) Gap junctions
B) Desmosomes
C) Sarcoplasmic reticulum
D) T-tubules
Answer: B) Desmosomes
Rationale: Desmosomes are anchoring junctions within the intercalated discs that mechanically hold
cardiac fibers together, preventing them from separating during strenuous contractions. Gap junctions
provide electrical coupling, not structural reinforcement.
14. Which heart sound (lub-dup) is produced by the closure of the atrioventricular (AV) valves at the
onset of ventricular systole?
A) First heart sound (S1)
B) Second heart sound (S2)
C) Third heart sound (S3)
D) Murmur
Answer: A) First heart sound (S1)
Rationale: The first heart sound (S1), or "lub," happens when ventricular pressure rises above atrial
pressure, causing the tricuspid and mitral (AV) valves to snap shut. The second sound (S2) is caused by
the closure of the semilunar valves.
15. What structural remnant connects the arch of the aorta to the pulmonary trunk in an adult
heart?
A) Ductus venosus
B) Foramen ovale
C) Ligamentum arteriosum
D) Fossa ovalis
Answer: C) Ligamentum arteriosum
Rationale: The ligamentum arteriosum is the fibrous cord remnant of the fetal ductus arteriosus, which
functioned in utero to shunt blood directly from the pulmonary trunk into the aorta to bypass the
collapsed fetal lungs.
Exam Questions with complete updated Answers 2026 -
2027
Master your BIOL 252 Human Anatomy & Physiology II Module 2 Exam with this comprehensive study guide.
Features 200 rigorous, high-yield multiple-choice questions complete with correct answers and detailed
italicized rationales. Perfect for mastering the cardiovascular system, intrinsic conduction pathways, heart wall
layers, and valve mechanics. Review efficiently, test your understanding, and ace your Portage / Geneva College
nursing and allied health exam!
1. Which layer of the heart wall is responsible for the actual pumping mechanism and contraction
of the heart?
A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium
Answer: B) Myocardium
Rationale: The myocardium is the middle, thick layer of the heart wall composed entirely of cardiac
muscle cells. It is the layer directly responsible for the forceful contraction and pumping action of the
heart. The epicardium is the outer protective layer, and the endocardium is the smooth inner endothelial
lining.
2. What is the correct sequence of electrical current flow through the intrinsic conduction system
of the heart?
A) AV Node -> SA Node -> Bundle of His -> Purkinje Fibers
B) SA Node -> AV Node -> Bundle of His -> Bundle Branches -> Purkinje Fibers
C) SA Node -> Bundle Branches -> AV Node -> Purkinje Fibers
D) AV Node -> Bundle of His -> Purkinje Fibers -> SA Node
Answer: B) SA Node -> AV Node -> Bundle of His -> Bundle Branches -> Purkinje Fibers
Rationale: The intrinsic conduction system begins at the sinoatrial (SA) node (the pacemaker). The signal
then travels to the atrioventricular (AV) node, where it is briefly delayed. From there, it passes into the
Bundle of His (AV bundle), splits into the right and left bundle branches within the interventricular
septum, and finally spreads through the Purkinje fibers to trigger ventricular contraction.
3. Which anatomical structures anchor the atrioventricular valve cusps to prevent them from
everting into the atria during ventricular contraction?
A) Fossa ovalis
B) Pectinate muscles
C) Chordae tendineae and papillary muscles
D) Trabeculae carneae
Answer: C) Chordae tendineae and papillary muscles
Rationale: Chordae tendineae (the "heart strings") connect the cusps of the tricuspid and bicuspid
,(mitral) valves to the papillary muscles projecting from the ventricular walls. When the ventricles
contract, the papillary muscles pull on these strings, preventing the valves from blowing inside-out
(everting) into the atria.
4. Which valve prevents the backflow of oxygenated blood from the aorta into the left ventricle?
A) Tricuspid valve
B) Mitral valve
C) Pulmonary semilunar valve
D) Aortic semilunar valve
Answer: D) Aortic semilunar valve
Rationale: The aortic semilunar valve sits between the left ventricle and the aorta. It opens to allow
oxygenated blood to enter systemic circulation and snaps shut during ventricular relaxation to prevent
that blood from leaking backward into the left ventricle.
5. What is the primary function of the gap junctions located within the intercalated discs of cardiac
muscle fibers?
A) Securing the cells mechanically to prevent tearing
B) Allowing rapid passage of ions to electrically couple adjacent cells
C) Preventing calcium ions from entering the cytoplasm
D) Anchoring the thick myosin filaments to the Z discs
Answer: B) Allowing rapid passage of ions to electrically couple adjacent cells
Rationale: Gap junctions are microscopic channels within the intercalated discs that allow ions to flow
freely and instantly from one cardiac cell to the next. This electrical coupling ensures that the entire
chamber contracts as a single, coordinated unit (a functional syncytium). Desmosomes, not gap
junctions, provide the mechanical strength to prevent tearing.
6. Which blood vessel carries deoxygenated blood away from the right ventricle toward the lungs?
A) Pulmonary trunk
B) Aorta
C) Superior vena cava
D) Pulmonary veins
Answer: A) Pulmonary trunk
Rationale: The right ventricle pumps oxygen-poor blood through the pulmonary semilunar valve into the
pulmonary trunk, which branches into pulmonary arteries heading to the lungs. Pulmonary veins carry
oxygenated blood back to the heart, while the aorta carries oxygenated blood to the body.
7. What thin, visceral layer is closely applied to the outer surface of the myocardium and forms the
inner layer of the pericardial sac?
A) Fibrous pericardium
B) Parietal pericardium
C) Epicardium
D) Endocardium
Answer: C) Epicardium
Rationale: The epicardium is structurally identical to the visceral layer of the serous pericardium. It lines
,the outer surface of the heart muscle, while the parietal pericardium lines the outer cavity wall and the
fibrous pericardium forms the tough external sac.
8. Which structure represents the shallow depression in the interatrial septum that is a remnant of
an opening in the fetal heart?
A) Foramen magnum
B) Fossa ovalis
C) Ligamentum arteriosum
D) Ductus arteriosus
Answer: B) Fossa ovalis
Rationale: The fossa ovalis is the adult remnant of the fetal foramen ovale, an opening that allowed
blood to bypass the non-functional fetal lungs by flowing directly from the right atrium to the left atrium.
9. Which specific chamber has the thickest myocardium because it must generate enough pressure
to pump blood throughout the entire systemic circulation?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: D) Left ventricle
Rationale: The left ventricle features walls roughly three times thicker than the right ventricle. It must
overcome high resistance to force blood through the entire body, whereas the right ventricle only pumps
short distances to the low-resistance pulmonary circuit.
10. What electrical event on an electrocardiogram (ECG) represents the depolarization of the
ventricles?
A) P wave
B) QRS complex
C) T wave
D) PR interval
Answer: B) QRS complex
Rationale: The QRS complex represents ventricular depolarization, which spreads rapidly through the
ventricular walls and precedes ventricular contraction. The P wave represents atrial depolarization, and
the T wave signifies ventricular repolarization.
11. Why does the electrical impulse experience a brief delay at the atrioventricular (AV) node?
A) To allow the ventricles to finish repolarizing
B) To permit the atria to fully contract and empty blood into the ventricles
C) To allow the semilunar valves time to close safely
D) To prevent the SA node from firing too rapidly
Answer: B) To permit the atria to fully contract and empty blood into the ventricles
Rationale: The roughly 0.1-second delay at the AV node ensures that the atria complete their contraction
(atrial systole) and fully top off ventricular volume before the ventricles are stimulated to contract.
, 12. During which phase of the cardiac cycle do all four heart valves remain closed while ventricular
pressure rises without any changes in volume?
A) Isovolumetric contraction phase
B) Isovolumetric relaxation phase
C) Ventricular ejection phase
D) Passive ventricular filling phase
Answer: A) Isovolumetric contraction phase
Rationale: Isovolumetric contraction occurs at the beginning of ventricular systole. The AV valves snap
shut due to rising pressure, but the pressure is not yet high enough to push open the semilunar valves.
Volume remains constant as pressure spikes.
13. What cardiac tissue modification holds adjacent cardiac muscle cells tightly together against
mechanical stress during contractions?
A) Gap junctions
B) Desmosomes
C) Sarcoplasmic reticulum
D) T-tubules
Answer: B) Desmosomes
Rationale: Desmosomes are anchoring junctions within the intercalated discs that mechanically hold
cardiac fibers together, preventing them from separating during strenuous contractions. Gap junctions
provide electrical coupling, not structural reinforcement.
14. Which heart sound (lub-dup) is produced by the closure of the atrioventricular (AV) valves at the
onset of ventricular systole?
A) First heart sound (S1)
B) Second heart sound (S2)
C) Third heart sound (S3)
D) Murmur
Answer: A) First heart sound (S1)
Rationale: The first heart sound (S1), or "lub," happens when ventricular pressure rises above atrial
pressure, causing the tricuspid and mitral (AV) valves to snap shut. The second sound (S2) is caused by
the closure of the semilunar valves.
15. What structural remnant connects the arch of the aorta to the pulmonary trunk in an adult
heart?
A) Ductus venosus
B) Foramen ovale
C) Ligamentum arteriosum
D) Fossa ovalis
Answer: C) Ligamentum arteriosum
Rationale: The ligamentum arteriosum is the fibrous cord remnant of the fetal ductus arteriosus, which
functioned in utero to shunt blood directly from the pulmonary trunk into the aorta to bypass the
collapsed fetal lungs.
