MSNC 505 WEEK 5: ADVANCED
PATHOPHYSIOLOGY OF
CARDIOVASCULAR AND
RESPIRATORY SYSTEMS QUESTIONS
AND DETAILED SOLUTIONS JUST
RELEASED
1. Which mechanism best explains the development of left ventricular hypertrophy in a
patient with chronic systemic hypertension?
A. Increased afterload resulting in parallel addition of sarcomeres
B. Increased preload leading to sarcomere lengthening in series
C. Decreased myocardial oxygen demand triggering cellular division
D. Activation of the parasympathetic nervous system causing myocyte growth
Answer: A
Conceptual Explanation: Chronic hypertension increases afterload, which stimulates
cardiac myocytes to add sarcomeres in parallel, thickening the wall to normalize wall stress
(Laplace’s Law).
2. In the compensatory phase of heart failure, how does the activation of the renin-
angiotensin-aldosterone system (RAAS) initially affect cardiac output?
A. Increases stroke volume by decreasing systemic vascular resistance
,B. Increases preload through sodium and water retention to enhance the Frank-Starling
mechanism
C. Decreases preload to reduce myocardial wall tension
D. Directly inhibits catecholamine release to prevent tachycardia
Answer: B
Conceptual Explanation: RAAS activation promotes fluid retention, increasing venous
return (preload). According to the Frank-Starling law, increased stretch leads to increased
force of contraction and stroke volume, up to a point.
3. A patient is diagnosed with B-type natriuretic peptide (BNP) elevation. What is the primary
physiological trigger for the release of this peptide?
A. Atrial stretch due to volume overload
B. Sympathetic stimulation of the adrenal medulla
C. Ventricular wall stretch due to increased pressure or volume
D. Renal hypoxia stimulating the juxtaglomerular apparatus
Answer: C
Conceptual Explanation: BNP is primarily synthesized and secreted by the ventricles in
response to increased wall stress, serving as a diagnostic marker for heart failure.
, 4. Which valvular disorder is most characterized by a mid-systolic click followed by a late
systolic murmur?
A. Aortic Stenosis
B. Mitral Valve Prolapse
C. Mitral Stenosis
D. Tricuspid Regurgitation
Answer: B
Conceptual Explanation: Mitral valve prolapse (MVP) typically presents with a mid-
systolic click as the leaflets billow into the left atrium, followed by a murmur if
regurgitation occurs.
5. Which statement accurately describes the pathophysiology of Prinzmetal (variant) angina?
A. It results from vasospasm of the coronary arteries, often occurring at rest
B. It is caused by fixed atherosclerotic plaques that narrow the lumen by 70%
C. It is always associated with exertion and relieved by rest
D. It is caused by the rupture of an unstable plaque and thrombus formation
Answer: A
Conceptual Explanation: Prinzmetal angina is characterized by episodic chest pain caused
by coronary artery vasospasm, not necessarily related to atherosclerosis or exertion.
PATHOPHYSIOLOGY OF
CARDIOVASCULAR AND
RESPIRATORY SYSTEMS QUESTIONS
AND DETAILED SOLUTIONS JUST
RELEASED
1. Which mechanism best explains the development of left ventricular hypertrophy in a
patient with chronic systemic hypertension?
A. Increased afterload resulting in parallel addition of sarcomeres
B. Increased preload leading to sarcomere lengthening in series
C. Decreased myocardial oxygen demand triggering cellular division
D. Activation of the parasympathetic nervous system causing myocyte growth
Answer: A
Conceptual Explanation: Chronic hypertension increases afterload, which stimulates
cardiac myocytes to add sarcomeres in parallel, thickening the wall to normalize wall stress
(Laplace’s Law).
2. In the compensatory phase of heart failure, how does the activation of the renin-
angiotensin-aldosterone system (RAAS) initially affect cardiac output?
A. Increases stroke volume by decreasing systemic vascular resistance
,B. Increases preload through sodium and water retention to enhance the Frank-Starling
mechanism
C. Decreases preload to reduce myocardial wall tension
D. Directly inhibits catecholamine release to prevent tachycardia
Answer: B
Conceptual Explanation: RAAS activation promotes fluid retention, increasing venous
return (preload). According to the Frank-Starling law, increased stretch leads to increased
force of contraction and stroke volume, up to a point.
3. A patient is diagnosed with B-type natriuretic peptide (BNP) elevation. What is the primary
physiological trigger for the release of this peptide?
A. Atrial stretch due to volume overload
B. Sympathetic stimulation of the adrenal medulla
C. Ventricular wall stretch due to increased pressure or volume
D. Renal hypoxia stimulating the juxtaglomerular apparatus
Answer: C
Conceptual Explanation: BNP is primarily synthesized and secreted by the ventricles in
response to increased wall stress, serving as a diagnostic marker for heart failure.
, 4. Which valvular disorder is most characterized by a mid-systolic click followed by a late
systolic murmur?
A. Aortic Stenosis
B. Mitral Valve Prolapse
C. Mitral Stenosis
D. Tricuspid Regurgitation
Answer: B
Conceptual Explanation: Mitral valve prolapse (MVP) typically presents with a mid-
systolic click as the leaflets billow into the left atrium, followed by a murmur if
regurgitation occurs.
5. Which statement accurately describes the pathophysiology of Prinzmetal (variant) angina?
A. It results from vasospasm of the coronary arteries, often occurring at rest
B. It is caused by fixed atherosclerotic plaques that narrow the lumen by 70%
C. It is always associated with exertion and relieved by rest
D. It is caused by the rupture of an unstable plaque and thrombus formation
Answer: A
Conceptual Explanation: Prinzmetal angina is characterized by episodic chest pain caused
by coronary artery vasospasm, not necessarily related to atherosclerosis or exertion.
