BIOS255 Anatomy and Physiology III with Lab Actual Exam
2026/2027 | Final Exam | Complete Questions and Verified
Answers | Pass Guaranteed - A+ Graded
Cardiovascular System: Heart & Hemodynamics
Q1: Which anatomical feature of the heart directly separates the right atrium from the
left atrium, preventing oxygen-rich and oxygen-poor blood from mixing?
A. The interventricular septum
B. The atrioventricular septum [CORRECT]
C. The valve of the foramen ovale
D. The coronary sulcus
Correct Answer: B
Rationale: The best answer is B because the atrioventricular septum is the solid
physical wall between the two upper chambers, whereas the interventricular septum
separates the lower chambers.
Q2: During auscultation of a patient's heart, you hear a loud "lub-dub" sound. What
specific mechanical event creates the "lub" (S1) sound?
A. The snapping shut of the semilunar valves.
B. The contraction of the papillary muscles.
C. The closing of the atrioventricular (AV) valves as ventricular pressure rises.
[CORRECT]
D. The rapid filling of the ventricles during atrial systole.
Correct Answer: C
Rationale: This choice is correct because the first heart sound is generated when the
ventricles begin to contract and the increasing pressure forces the tricuspid and mitral
valves closed to prevent backflow into the atria.
Q3: A student is analyzing an ECG strip and notices that the time between the
beginning of the P wave and the beginning of the QRS complex is 0.24 seconds. What
does this prolonged interval indicate?
A. Delayed ventricular depolarization.
B. First-degree heart block, indicating slowed conduction through the AV node.
[CORRECT]
C. An ectopic pacemaker firing in the bundle of His.
D. Myocardial ischemia in the left ventricle.
Correct Answer: B
,Rationale: The best answer is B because the PR interval represents the time it takes for
the electrical impulse to travel from the atria through the AV node; a measurement
greater than 0.20 seconds signifies a delay in this specific conduction pathway.
Q4: A 68-year-old patient with congestive heart failure (CHF) presents to the clinic with
jugular venous distention (JVD), bilateral peripheral edema, and pulmonary crackles.
Which underlying hemodynamic failure is directly responsible for these specific signs?
A. Decreased afterload causing poor forward flow.
B. Increased preload and venous congestion causing fluid backup into the systemic and
pulmonary circulations. [CORRECT]
C. Increased contractility pushing too much fluid into the capillaries.
D. Decreased heart rate limiting oxygen delivery to tissues.
Correct Answer: B
Rationale: This choice is correct because a failing heart cannot pump blood forward
efficiently, causing blood to back up into the venous system; this increased venous
pressure (preload) forces fluid out of capillaries into the tissues (edema) and lungs
(crackles).
Q5: Which chamber of the heart has the thickest myocardial wall, and why is this
structural adaptation necessary?
A. Right ventricle; it pumps blood to the highly resistant pulmonary circuit.
B. Left atrium; it must generate strong pressure to force blood through the mitral valve.
C. Left ventricle; it must generate high pressure to eject blood into the systemic
circulation. [CORRECT]
D. Right atrium; it receives deoxygenated blood from the entire body.
Correct Answer: C
Rationale: The best answer is C because the systemic circuit requires a massive
amount of pressure to perfuse all the body's tissues against gravity, demanding a much
thicker muscular wall in the left ventricle compared to the low-pressure right side.
Q6: A patient is receiving a continuous IV infusion of a medication that increases the
contractility of the myocardium without significantly changing heart rate or venous
return. According to the Frank-Starling mechanism, how will this affect the patient's
stroke volume?
A. Stroke volume will decrease due to increased afterload.
B. Stroke volume will remain unchanged because end-diastolic volume hasn't changed.
C. Stroke volume will increase because the ventricle can eject a larger fraction of its
end-diastolic volume. [CORRECT]
D. Stroke volume will decrease as a direct result of increased contractility.
Correct Answer: C
, Rationale: This choice is correct because contractility represents the intrinsic strength of
the cardiac muscle fibers; even if the starting stretch (preload) remains the same,
stronger fibers will squeeze harder and empty more completely, raising the stroke
volume.
Q7: During the isovolumetric contraction phase of the cardiac cycle, what is happening
to the volume of blood inside the ventricles?
A. Blood volume is rapidly decreasing as it is ejected into the aorta.
B. Blood volume is rapidly increasing as the atria contract.
C. Blood volume remains constant because all four heart valves are closed.
[CORRECT]
D. Blood volume fluctuates as the semilunar valves partially open and close.
Correct Answer: C
Rationale: The best answer is C because "isovolumetric" literally means "same volume";
the ventricular pressure is rising to overcome the pressure in the aorta and pulmonary
trunk, but until it does, the valves are shut and no blood can enter or leave.
Q8: The right coronary artery (RCA) primarily supplies blood to which specific areas of
the heart?
A. The left ventricle and anterior two-thirds of the interventricular septum.
B. The right atrium, right ventricle, and a portion of the posterior interventricular septum.
[CORRECT]
C. The left atrium and the anterior papillary muscles.
D. The entire left ventricle and the bundle of His.
Correct Answer: B
Rationale: This choice is correct because while variations exist, the RCA is the primary
blood supply for the right side of the heart and often gives off the posterior descending
artery (PDA) that supplies the bottom portion of the septum.
Q9: A patient's blood pressure suddenly drops, triggering the baroreceptor reflex. Which
of the following autonomic nervous system changes will occur to restore blood
pressure?
A. Increased parasympathetic outflow to the SA node and vasodilation of skeletal
muscle arterioles.
B. Decreased sympathetic outflow to the adrenal medulla and decreased heart rate.
C. Increased sympathetic outflow causing vasoconstriction and increased heart rate.
[CORRECT]
D. Increased parasympathetic outflow causing bradycardia and increased stroke
volume.
Correct Answer: C
2026/2027 | Final Exam | Complete Questions and Verified
Answers | Pass Guaranteed - A+ Graded
Cardiovascular System: Heart & Hemodynamics
Q1: Which anatomical feature of the heart directly separates the right atrium from the
left atrium, preventing oxygen-rich and oxygen-poor blood from mixing?
A. The interventricular septum
B. The atrioventricular septum [CORRECT]
C. The valve of the foramen ovale
D. The coronary sulcus
Correct Answer: B
Rationale: The best answer is B because the atrioventricular septum is the solid
physical wall between the two upper chambers, whereas the interventricular septum
separates the lower chambers.
Q2: During auscultation of a patient's heart, you hear a loud "lub-dub" sound. What
specific mechanical event creates the "lub" (S1) sound?
A. The snapping shut of the semilunar valves.
B. The contraction of the papillary muscles.
C. The closing of the atrioventricular (AV) valves as ventricular pressure rises.
[CORRECT]
D. The rapid filling of the ventricles during atrial systole.
Correct Answer: C
Rationale: This choice is correct because the first heart sound is generated when the
ventricles begin to contract and the increasing pressure forces the tricuspid and mitral
valves closed to prevent backflow into the atria.
Q3: A student is analyzing an ECG strip and notices that the time between the
beginning of the P wave and the beginning of the QRS complex is 0.24 seconds. What
does this prolonged interval indicate?
A. Delayed ventricular depolarization.
B. First-degree heart block, indicating slowed conduction through the AV node.
[CORRECT]
C. An ectopic pacemaker firing in the bundle of His.
D. Myocardial ischemia in the left ventricle.
Correct Answer: B
,Rationale: The best answer is B because the PR interval represents the time it takes for
the electrical impulse to travel from the atria through the AV node; a measurement
greater than 0.20 seconds signifies a delay in this specific conduction pathway.
Q4: A 68-year-old patient with congestive heart failure (CHF) presents to the clinic with
jugular venous distention (JVD), bilateral peripheral edema, and pulmonary crackles.
Which underlying hemodynamic failure is directly responsible for these specific signs?
A. Decreased afterload causing poor forward flow.
B. Increased preload and venous congestion causing fluid backup into the systemic and
pulmonary circulations. [CORRECT]
C. Increased contractility pushing too much fluid into the capillaries.
D. Decreased heart rate limiting oxygen delivery to tissues.
Correct Answer: B
Rationale: This choice is correct because a failing heart cannot pump blood forward
efficiently, causing blood to back up into the venous system; this increased venous
pressure (preload) forces fluid out of capillaries into the tissues (edema) and lungs
(crackles).
Q5: Which chamber of the heart has the thickest myocardial wall, and why is this
structural adaptation necessary?
A. Right ventricle; it pumps blood to the highly resistant pulmonary circuit.
B. Left atrium; it must generate strong pressure to force blood through the mitral valve.
C. Left ventricle; it must generate high pressure to eject blood into the systemic
circulation. [CORRECT]
D. Right atrium; it receives deoxygenated blood from the entire body.
Correct Answer: C
Rationale: The best answer is C because the systemic circuit requires a massive
amount of pressure to perfuse all the body's tissues against gravity, demanding a much
thicker muscular wall in the left ventricle compared to the low-pressure right side.
Q6: A patient is receiving a continuous IV infusion of a medication that increases the
contractility of the myocardium without significantly changing heart rate or venous
return. According to the Frank-Starling mechanism, how will this affect the patient's
stroke volume?
A. Stroke volume will decrease due to increased afterload.
B. Stroke volume will remain unchanged because end-diastolic volume hasn't changed.
C. Stroke volume will increase because the ventricle can eject a larger fraction of its
end-diastolic volume. [CORRECT]
D. Stroke volume will decrease as a direct result of increased contractility.
Correct Answer: C
, Rationale: This choice is correct because contractility represents the intrinsic strength of
the cardiac muscle fibers; even if the starting stretch (preload) remains the same,
stronger fibers will squeeze harder and empty more completely, raising the stroke
volume.
Q7: During the isovolumetric contraction phase of the cardiac cycle, what is happening
to the volume of blood inside the ventricles?
A. Blood volume is rapidly decreasing as it is ejected into the aorta.
B. Blood volume is rapidly increasing as the atria contract.
C. Blood volume remains constant because all four heart valves are closed.
[CORRECT]
D. Blood volume fluctuates as the semilunar valves partially open and close.
Correct Answer: C
Rationale: The best answer is C because "isovolumetric" literally means "same volume";
the ventricular pressure is rising to overcome the pressure in the aorta and pulmonary
trunk, but until it does, the valves are shut and no blood can enter or leave.
Q8: The right coronary artery (RCA) primarily supplies blood to which specific areas of
the heart?
A. The left ventricle and anterior two-thirds of the interventricular septum.
B. The right atrium, right ventricle, and a portion of the posterior interventricular septum.
[CORRECT]
C. The left atrium and the anterior papillary muscles.
D. The entire left ventricle and the bundle of His.
Correct Answer: B
Rationale: This choice is correct because while variations exist, the RCA is the primary
blood supply for the right side of the heart and often gives off the posterior descending
artery (PDA) that supplies the bottom portion of the septum.
Q9: A patient's blood pressure suddenly drops, triggering the baroreceptor reflex. Which
of the following autonomic nervous system changes will occur to restore blood
pressure?
A. Increased parasympathetic outflow to the SA node and vasodilation of skeletal
muscle arterioles.
B. Decreased sympathetic outflow to the adrenal medulla and decreased heart rate.
C. Increased sympathetic outflow causing vasoconstriction and increased heart rate.
[CORRECT]
D. Increased parasympathetic outflow causing bradycardia and increased stroke
volume.
Correct Answer: C
