NU606 | NU606 Advanced Pathophysiology Exam 2
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A 55-year-old male presents with fatigue and shortness of breath. Examination
reveals a microcytic, hypochromic anemia. Which of the following is the most likely
pathophysiological mechanism for this condition?
A. Vitamin B12 deficiency
B. Chronic blood loss leading to iron deficiency
C. Folic acid deficiency
D. Erythropoietin deficiency
Correct Answer: B
Expert Explanation: Microcytic hypochromic anemia is most commonly caused by
iron deficiency, which in an adult male often results from occult chronic blood loss.
Iron is a necessary component of the heme group in hemoglobin, and its absence
leads to smaller, paler red blood cells. In contrast, B12 and folate deficiencies result
in macrocytic anemias.
2. Which compensatory mechanism is activated in response to decreased cardiac
output in heart failure?
A. Decreased sympathetic nervous system activity
,B. Inhibition of the renin-angiotensin-aldosterone system (RAAS)
C. Increased secretion of B-type natriuretic peptide (BNP)
D. Decreased ADH secretion
Correct Answer: C
Expert Explanation: BNP is secreted by the ventricles in response to increased wall
stretch and pressure overload. It acts as a compensatory mechanism by promoting
diuresis, natriuresis, and vasodilation to reduce the workload of the heart.
Conversely, the sympathetic system and RAAS are typically activated, not inhibited,
in early heart failure stages.
3. In the pathophysiology of asthma, what is the primary cause of airway obstruction?
A. Destruction of alveolar walls
B. Chronic productive cough for three months
C. Permanent dilation of the bronchi
D. Bronchial hyperresponsiveness and inflammation
Correct Answer: D
Expert Explanation: Asthma is characterized by reversible airway obstruction
caused by bronchial smooth muscle constriction, mucosal edema, and mucus
hypersecretion. This is triggered by an exaggerated immune response to allergens
,or irritants. Chronic inflammation leads to airway remodeling over time if not
managed properly.
4. A patient is diagnosed with right-sided heart failure. Which clinical finding is most
characteristic of this condition?
A. Pulmonary edema
B. Jugular venous distension (JVD)
C. Orthopnea
D. Crackles in the lung bases
Correct Answer: B
Expert Explanation: Right-sided heart failure leads to backflow of blood into the
systemic venous circulation. This results in clinical signs such as jugular venous
distension, peripheral edema, and hepatomegaly. Pulmonary symptoms like
crackles and orthopnea are more characteristic of left-sided heart failure.
5. What is the primary underlying cause of the development of atherosclerosis?
A. Congenital narrowing of the aorta
B. Vasospasm of the coronary arteries
C. Increased venous pressure
D. Chronic inflammation and endothelial injury
, Correct Answer: D
Expert Explanation: Atherosclerosis begins with endothelial injury caused by
factors like hypertension, smoking, or hyperlipidemia. This triggers an
inflammatory response where lipids and macrophages accumulate in the vessel wall
to form plaques. Over time, these plaques can calcify or rupture, leading to acute
vascular events.
6. Which type of anemia is associated with the loss of parietal cells in the stomach?
A. Aplastic anemia
B. Pernicious anemia
C. Sickle cell anemia
D. Thalassemia
Correct Answer: B
Expert Explanation: Pernicious anemia is an autoimmune condition where the
body attacks parietal cells or intrinsic factor. Without intrinsic factor, vitamin B12
cannot be absorbed in the ileum. This leads to megaloblastic changes in red blood
cells and potential neurological complications.
7. During an acute myocardial infarction, why does the ST segment elevate on an ECG?
A. Delayed conduction through the AV node
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A 55-year-old male presents with fatigue and shortness of breath. Examination
reveals a microcytic, hypochromic anemia. Which of the following is the most likely
pathophysiological mechanism for this condition?
A. Vitamin B12 deficiency
B. Chronic blood loss leading to iron deficiency
C. Folic acid deficiency
D. Erythropoietin deficiency
Correct Answer: B
Expert Explanation: Microcytic hypochromic anemia is most commonly caused by
iron deficiency, which in an adult male often results from occult chronic blood loss.
Iron is a necessary component of the heme group in hemoglobin, and its absence
leads to smaller, paler red blood cells. In contrast, B12 and folate deficiencies result
in macrocytic anemias.
2. Which compensatory mechanism is activated in response to decreased cardiac
output in heart failure?
A. Decreased sympathetic nervous system activity
,B. Inhibition of the renin-angiotensin-aldosterone system (RAAS)
C. Increased secretion of B-type natriuretic peptide (BNP)
D. Decreased ADH secretion
Correct Answer: C
Expert Explanation: BNP is secreted by the ventricles in response to increased wall
stretch and pressure overload. It acts as a compensatory mechanism by promoting
diuresis, natriuresis, and vasodilation to reduce the workload of the heart.
Conversely, the sympathetic system and RAAS are typically activated, not inhibited,
in early heart failure stages.
3. In the pathophysiology of asthma, what is the primary cause of airway obstruction?
A. Destruction of alveolar walls
B. Chronic productive cough for three months
C. Permanent dilation of the bronchi
D. Bronchial hyperresponsiveness and inflammation
Correct Answer: D
Expert Explanation: Asthma is characterized by reversible airway obstruction
caused by bronchial smooth muscle constriction, mucosal edema, and mucus
hypersecretion. This is triggered by an exaggerated immune response to allergens
,or irritants. Chronic inflammation leads to airway remodeling over time if not
managed properly.
4. A patient is diagnosed with right-sided heart failure. Which clinical finding is most
characteristic of this condition?
A. Pulmonary edema
B. Jugular venous distension (JVD)
C. Orthopnea
D. Crackles in the lung bases
Correct Answer: B
Expert Explanation: Right-sided heart failure leads to backflow of blood into the
systemic venous circulation. This results in clinical signs such as jugular venous
distension, peripheral edema, and hepatomegaly. Pulmonary symptoms like
crackles and orthopnea are more characteristic of left-sided heart failure.
5. What is the primary underlying cause of the development of atherosclerosis?
A. Congenital narrowing of the aorta
B. Vasospasm of the coronary arteries
C. Increased venous pressure
D. Chronic inflammation and endothelial injury
, Correct Answer: D
Expert Explanation: Atherosclerosis begins with endothelial injury caused by
factors like hypertension, smoking, or hyperlipidemia. This triggers an
inflammatory response where lipids and macrophages accumulate in the vessel wall
to form plaques. Over time, these plaques can calcify or rupture, leading to acute
vascular events.
6. Which type of anemia is associated with the loss of parietal cells in the stomach?
A. Aplastic anemia
B. Pernicious anemia
C. Sickle cell anemia
D. Thalassemia
Correct Answer: B
Expert Explanation: Pernicious anemia is an autoimmune condition where the
body attacks parietal cells or intrinsic factor. Without intrinsic factor, vitamin B12
cannot be absorbed in the ileum. This leads to megaloblastic changes in red blood
cells and potential neurological complications.
7. During an acute myocardial infarction, why does the ST segment elevate on an ECG?
A. Delayed conduction through the AV node
