NR283 Pathophysiology Guide Exam 2 Actual Exam
2026/2027 | Complete Exam-Style Questions with
Detailed Rationales | Pass Guaranteed – A+ Graded
SECTION 1: CARDIOVASCULAR DISORDERS (25 Questions)
Q1: A patient with left-sided heart failure develops dyspnea and a productive cough with
frothy pink sputum. Which pathophysiologic mechanism explains these findings?
A. Increased systemic venous pressure causing peripheral edema
B. Decreased preload leading to reduced cardiac output
C. Pulmonary congestion from blood backing up into the lungs
D. Right ventricular hypertrophy causing tricuspid regurgitation
Correct Answer: C
Rationale: Correct because left-sided heart failure causes blood to back up into the
pulmonary circulation, increasing pulmonary capillary hydrostatic pressure and leading
to pulmonary congestion, dyspnea, and frothy pink sputum from transudation of fluid
into alveoli.
Q2: A patient with right-sided heart failure presents with jugular venous distention,
hepatomegaly, and peripheral edema. Which mechanism best explains these
manifestations?
A. Decreased left ventricular contractility reducing systemic perfusion
B. Blood backing up into the systemic venous circulation
C. Increased pulmonary vascular resistance causing hypoxemia
D. Reduced coronary artery perfusion leading to ischemia
Correct Answer: B
Rationale: Correct because right-sided heart failure impairs the right ventricle's ability to
pump blood forward into the pulmonary circulation, causing blood to accumulate in the
systemic venous system and produce jugular venous distention, hepatomegaly, and
dependent edema.
,Q3: A 62-year-old male with crushing chest pain is diagnosed with an acute myocardial
infarction. Which laboratory marker is the most specific for confirming myocardial cell
death?
A. Creatine kinase-MB (CK-MB)
B. Myoglobin
C. Troponin I
D. Lactate dehydrogenase (LDH)
Correct Answer: C
Rationale: Correct because troponin I is highly specific for cardiac muscle injury, rises
within 3-6 hours after myocardial infarction, and remains elevated for 7-10 days, making
it the gold standard biomarker for detecting myocardial cell necrosis.
Q4: During atherosclerosis, which cellular process initiates plaque formation in the
arterial intima?
A. Smooth muscle cell apoptosis and calcification
B. Endothelial injury followed by lipid accumulation and macrophage infiltration
C. Collagen deposition and elastic fiber fragmentation
D. Platelet aggregation and thrombus formation
Correct Answer: B
Rationale: Correct because atherosclerosis begins with endothelial dysfunction or injury,
which allows low-density lipoprotein cholesterol to penetrate the intima where it
becomes oxidized, triggering macrophage recruitment and foam cell formation that
initiates the fatty streak.
Q5: A patient is diagnosed with primary (essential) hypertension. Which statement
accurately describes this condition?
A. It results from identifiable renal artery stenosis
B. It has no known cause and accounts for approximately 90-95% of hypertension cases
C. It is caused by pheochromocytoma secreting excess catecholamines
D. It develops secondary to chronic kidney disease
Correct Answer: B
Rationale: Correct because primary (essential) hypertension is idiopathic, meaning no
single identifiable cause exists, and it represents the vast majority of hypertension
cases, in contrast to secondary hypertension which has a known underlying cause.
,Q6: The renin-angiotensin-aldosterone system (RAAS) is activated in a patient with
decreased renal perfusion. Which sequence correctly describes the pathway?
A. Renin → Angiotensin I → ACE → Angiotensin II → Aldosterone secretion
B. Renin → Angiotensin II → ACE → Angiotensin I → Vasodilation
C. Aldosterone → Renin → Angiotensin I → ACE → Angiotensin II
D. ACE → Renin → Angiotensin II → Aldosterone → Sodium excretion
Correct Answer: A
Rationale: Correct because decreased renal perfusion triggers juxtaglomerular cells to
release renin, which converts angiotensinogen to angiotensin I; ACE in the lungs then
converts angiotensin I to angiotensin II, which stimulates aldosterone secretion from
the adrenal cortex, promoting vasoconstriction and sodium/water retention.
Q7: Which of the following is a modifiable risk factor for cardiovascular disease?
A. Family history of premature coronary artery disease
B. Male gender
C. Cigarette smoking
D. Advanced age
Correct Answer: C
Rationale: Correct because cigarette smoking is a modifiable risk factor that can be
eliminated through behavioral intervention; family history, gender, and age are
nonmodifiable risk factors determined by genetics and time.
Q8: A patient experiences chest pain during exertion that is relieved by rest and
sublingual nitroglycerin. This pattern is most consistent with:
A. Unstable angina
B. Stable angina
C. Myocardial infarction
D. Prinzmetal's angina
Correct Answer: B
Rationale: Correct because stable angina is characterized by predictable chest pain
triggered by physical exertion or emotional stress that resolves with rest or nitroglycerin,
reflecting a fixed atherosclerotic plaque causing transient myocardial ischemia.
Q9: Which component of the cardiac conduction system has the fastest intrinsic firing
rate and serves as the normal pacemaker of the heart?
, A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale: Correct because the SA node is located in the right atrium and has an
intrinsic firing rate of 60-100 beats per minute, which is faster than other pacemaker
cells, making it the dominant pacemaker under normal conditions.
Q10: The AV node is responsible for which physiologic function in the cardiac
conduction system?
A. Generating the initial electrical impulse
B. Delaying the impulse to allow complete atrial emptying before ventricular contraction
C. Conducting impulses directly to the ventricular myocardium
D. Coordinating simultaneous contraction of both atria
Correct Answer: B
Rationale: Correct because the AV node introduces a brief delay (approximately 0.1
second) in electrical conduction, which allows the atria to contract completely and fill
the ventricles before ventricular systole begins.
Q11: During the cardiac cycle, preload is best defined as:
A. The resistance the ventricle must overcome to eject blood
B. The volume of blood in the ventricle at the end of diastole
C. The force of ventricular contraction during systole
D. The pressure in the aorta during ventricular relaxation
Correct Answer: B
Rationale: Correct because preload represents the degree of ventricular muscle stretch
at the end of diastole, which is determined by the volume of blood returning to the
ventricle (end-diastolic volume) according to the Frank-Starling mechanism.
Q12: Afterload is best described as:
A. The volume of blood returning to the ventricle during diastole
B. The resistance against which the ventricle must pump to eject blood
C. The contractile force generated by the ventricular myocardium
D. The relaxation rate of the ventricle during diastole
Correct Answer: B
2026/2027 | Complete Exam-Style Questions with
Detailed Rationales | Pass Guaranteed – A+ Graded
SECTION 1: CARDIOVASCULAR DISORDERS (25 Questions)
Q1: A patient with left-sided heart failure develops dyspnea and a productive cough with
frothy pink sputum. Which pathophysiologic mechanism explains these findings?
A. Increased systemic venous pressure causing peripheral edema
B. Decreased preload leading to reduced cardiac output
C. Pulmonary congestion from blood backing up into the lungs
D. Right ventricular hypertrophy causing tricuspid regurgitation
Correct Answer: C
Rationale: Correct because left-sided heart failure causes blood to back up into the
pulmonary circulation, increasing pulmonary capillary hydrostatic pressure and leading
to pulmonary congestion, dyspnea, and frothy pink sputum from transudation of fluid
into alveoli.
Q2: A patient with right-sided heart failure presents with jugular venous distention,
hepatomegaly, and peripheral edema. Which mechanism best explains these
manifestations?
A. Decreased left ventricular contractility reducing systemic perfusion
B. Blood backing up into the systemic venous circulation
C. Increased pulmonary vascular resistance causing hypoxemia
D. Reduced coronary artery perfusion leading to ischemia
Correct Answer: B
Rationale: Correct because right-sided heart failure impairs the right ventricle's ability to
pump blood forward into the pulmonary circulation, causing blood to accumulate in the
systemic venous system and produce jugular venous distention, hepatomegaly, and
dependent edema.
,Q3: A 62-year-old male with crushing chest pain is diagnosed with an acute myocardial
infarction. Which laboratory marker is the most specific for confirming myocardial cell
death?
A. Creatine kinase-MB (CK-MB)
B. Myoglobin
C. Troponin I
D. Lactate dehydrogenase (LDH)
Correct Answer: C
Rationale: Correct because troponin I is highly specific for cardiac muscle injury, rises
within 3-6 hours after myocardial infarction, and remains elevated for 7-10 days, making
it the gold standard biomarker for detecting myocardial cell necrosis.
Q4: During atherosclerosis, which cellular process initiates plaque formation in the
arterial intima?
A. Smooth muscle cell apoptosis and calcification
B. Endothelial injury followed by lipid accumulation and macrophage infiltration
C. Collagen deposition and elastic fiber fragmentation
D. Platelet aggregation and thrombus formation
Correct Answer: B
Rationale: Correct because atherosclerosis begins with endothelial dysfunction or injury,
which allows low-density lipoprotein cholesterol to penetrate the intima where it
becomes oxidized, triggering macrophage recruitment and foam cell formation that
initiates the fatty streak.
Q5: A patient is diagnosed with primary (essential) hypertension. Which statement
accurately describes this condition?
A. It results from identifiable renal artery stenosis
B. It has no known cause and accounts for approximately 90-95% of hypertension cases
C. It is caused by pheochromocytoma secreting excess catecholamines
D. It develops secondary to chronic kidney disease
Correct Answer: B
Rationale: Correct because primary (essential) hypertension is idiopathic, meaning no
single identifiable cause exists, and it represents the vast majority of hypertension
cases, in contrast to secondary hypertension which has a known underlying cause.
,Q6: The renin-angiotensin-aldosterone system (RAAS) is activated in a patient with
decreased renal perfusion. Which sequence correctly describes the pathway?
A. Renin → Angiotensin I → ACE → Angiotensin II → Aldosterone secretion
B. Renin → Angiotensin II → ACE → Angiotensin I → Vasodilation
C. Aldosterone → Renin → Angiotensin I → ACE → Angiotensin II
D. ACE → Renin → Angiotensin II → Aldosterone → Sodium excretion
Correct Answer: A
Rationale: Correct because decreased renal perfusion triggers juxtaglomerular cells to
release renin, which converts angiotensinogen to angiotensin I; ACE in the lungs then
converts angiotensin I to angiotensin II, which stimulates aldosterone secretion from
the adrenal cortex, promoting vasoconstriction and sodium/water retention.
Q7: Which of the following is a modifiable risk factor for cardiovascular disease?
A. Family history of premature coronary artery disease
B. Male gender
C. Cigarette smoking
D. Advanced age
Correct Answer: C
Rationale: Correct because cigarette smoking is a modifiable risk factor that can be
eliminated through behavioral intervention; family history, gender, and age are
nonmodifiable risk factors determined by genetics and time.
Q8: A patient experiences chest pain during exertion that is relieved by rest and
sublingual nitroglycerin. This pattern is most consistent with:
A. Unstable angina
B. Stable angina
C. Myocardial infarction
D. Prinzmetal's angina
Correct Answer: B
Rationale: Correct because stable angina is characterized by predictable chest pain
triggered by physical exertion or emotional stress that resolves with rest or nitroglycerin,
reflecting a fixed atherosclerotic plaque causing transient myocardial ischemia.
Q9: Which component of the cardiac conduction system has the fastest intrinsic firing
rate and serves as the normal pacemaker of the heart?
, A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale: Correct because the SA node is located in the right atrium and has an
intrinsic firing rate of 60-100 beats per minute, which is faster than other pacemaker
cells, making it the dominant pacemaker under normal conditions.
Q10: The AV node is responsible for which physiologic function in the cardiac
conduction system?
A. Generating the initial electrical impulse
B. Delaying the impulse to allow complete atrial emptying before ventricular contraction
C. Conducting impulses directly to the ventricular myocardium
D. Coordinating simultaneous contraction of both atria
Correct Answer: B
Rationale: Correct because the AV node introduces a brief delay (approximately 0.1
second) in electrical conduction, which allows the atria to contract completely and fill
the ventricles before ventricular systole begins.
Q11: During the cardiac cycle, preload is best defined as:
A. The resistance the ventricle must overcome to eject blood
B. The volume of blood in the ventricle at the end of diastole
C. The force of ventricular contraction during systole
D. The pressure in the aorta during ventricular relaxation
Correct Answer: B
Rationale: Correct because preload represents the degree of ventricular muscle stretch
at the end of diastole, which is determined by the volume of blood returning to the
ventricle (end-diastolic volume) according to the Frank-Starling mechanism.
Q12: Afterload is best described as:
A. The volume of blood returning to the ventricle during diastole
B. The resistance against which the ventricle must pump to eject blood
C. The contractile force generated by the ventricular myocardium
D. The relaxation rate of the ventricle during diastole
Correct Answer: B
