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NR507 / NR 507 Midterm Exam (Latest
2025/2026 Update) Advanced
Pathophysiology | Complete Guide with
Questions and Verified Answers | 100%
Correct | Grade A – Chamberlain
Question 1
What is the primary trigger for angina pectoris?
A) Myocardial necrosis
B) Myocardial ischemia
C) Hyperlipidemia
D) Atherosclerotic lesions
Correct Answer: B
Explanation: Angina pectoris is caused by myocardial ischemia, a temporary reduction in blood
supply to the heart muscle, often due to coronary artery narrowing. This leads to inadequate
oxygen delivery, causing chest pain. Myocardial necrosis (A) indicates infarction, a more severe
outcome. Hyperlipidemia (C) is a risk factor but not the direct trigger. Atherosclerotic lesions
(D) contribute to ischemia but are not the immediate cause. Clinical Reasoning: Recognizing
ischemia as the trigger guides urgent interventions like nitroglycerin to restore blood flow.
Question 2
Which hypersensitivity reaction is associated with anaphylaxis after a bee sting?
A) Type II (Cytotoxic)
B) Type I (Allergic/IgE-mediated)
C) Type III (Immune complex)
D) Type IV (Cell-mediated)
Correct Answer: B
Explanation: Type I hypersensitivity involves IgE-mediated release of histamine and other
mediators, causing immediate reactions like anaphylaxis (e.g., swollen lips, throat tightness,
shortness of breath after a bee sting). Type II (A) involves IgG/IgM targeting specific cells (e.g.,
hemolysis). Type III (C) involves immune complex deposition (e.g., lupus). Type IV (D) is
delayed, cell-mediated (e.g., contact dermatitis). Clinical Reasoning: Rapid recognition of Type
I hypersensitivity prompts epinephrine administration to reverse anaphylaxis.
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Question 3
A patient with chronic kidney disease presents with elevated serum creatinine. What is the
primary pathophysiological cause?
A) Increased glomerular filtration rate
B) Decreased nephron function
C) Excessive tubular reabsorption
D) Reduced renal artery perfusion
Correct Answer: B
Explanation: Elevated serum creatinine results from decreased nephron function, reducing the
kidneys’ ability to filter and excrete waste. This is common in chronic kidney disease due to
progressive nephron loss. Increased glomerular filtration rate (A) would lower creatinine.
Excessive reabsorption (C) does not directly cause creatinine elevation. Reduced perfusion (D)
may contribute but is secondary to nephron loss. Clinical Reasoning: Monitoring creatinine
guides staging of kidney disease and treatment planning.
Question 4
What is the most abundant plasma protein?
A) Globulin
B) Albumin
C) Clotting factors
D) Complement proteins
Correct Answer: B
Explanation: Albumin, comprising about 60% of total plasma protein (approximately 4 g/dL),
maintains oncotic pressure and transports substances. Globulin (A) includes antibodies but is less
abundant. Clotting factors (C) and complement proteins (D) have specific roles but lower
concentrations. Clinical Reasoning: Low albumin levels may indicate liver dysfunction or
malnutrition, impacting fluid balance and drug transport.
Question 5
A patient with asthma exhibits wheezing and dyspnea. What is the primary pathophysiological
mechanism?
A) Alveolar destruction
B) Bronchoconstriction
C) Pulmonary edema
D) Pleural effusion
Correct Answer: B
Explanation: Asthma is characterized by reversible bronchoconstriction due to airway
inflammation and hyperresponsiveness, causing wheezing and dyspnea. Alveolar destruction (A)
is seen in emphysema. Pulmonary edema (C) results from fluid overload, typically in heart
, 3
failure. Pleural effusion (D) involves fluid in the pleural space, not airways. Clinical Reasoning:
Bronchodilators (e.g., albuterol) target bronchoconstriction to relieve symptoms.
Question 6
Which condition is most likely to cause right heart failure due to elevated pulmonary vascular
resistance?
A) Left heart failure
B) Pulmonary disease
C) Systemic hypertension
D) Aortic stenosis
Correct Answer: B
Explanation: Pulmonary diseases (e.g., COPD, pulmonary hypertension) increase pulmonary
vascular resistance, forcing the right ventricle to work harder, leading to right heart failure. Left
heart failure (A) causes pulmonary edema but not primarily right-sided failure. Systemic
hypertension (C) affects the left heart. Aortic stenosis (D) increases left ventricular pressure.
Clinical Reasoning: Identifying right heart failure prompts evaluation of pulmonary causes to
guide treatment.
Question 7
A patient presents with sudden palpitations, shakiness, and blood pressure of 210/105 mmHg.
What diagnosis is most likely?
A) Myxedema coma
B) Addison’s disease
C) Thyrotoxicosis
D) Pheochromocytoma
Correct Answer: D
Explanation: Pheochromocytoma, a catecholamine-secreting adrenal tumor, causes episodic
hypertension, palpitations, and shakiness due to excess norepinephrine and epinephrine.
Myxedema coma (A) presents with hypothermia and lethargy. Addison’s disease (B) causes
hypotension and fatigue. Thyrotoxicosis (C) may cause palpitations but typically with weight
loss and heat intolerance. Clinical Reasoning: Suspecting pheochromocytoma prompts
catecholamine testing and imaging.
Question 8
What is the purpose of the spirometry measurement in a patient with suspected COPD?
A) Evaluate the cause of hypoxia
B) Measure volume and flow rate during forced expiration
NR507 / NR 507 Midterm Exam (Latest
2025/2026 Update) Advanced
Pathophysiology | Complete Guide with
Questions and Verified Answers | 100%
Correct | Grade A – Chamberlain
Question 1
What is the primary trigger for angina pectoris?
A) Myocardial necrosis
B) Myocardial ischemia
C) Hyperlipidemia
D) Atherosclerotic lesions
Correct Answer: B
Explanation: Angina pectoris is caused by myocardial ischemia, a temporary reduction in blood
supply to the heart muscle, often due to coronary artery narrowing. This leads to inadequate
oxygen delivery, causing chest pain. Myocardial necrosis (A) indicates infarction, a more severe
outcome. Hyperlipidemia (C) is a risk factor but not the direct trigger. Atherosclerotic lesions
(D) contribute to ischemia but are not the immediate cause. Clinical Reasoning: Recognizing
ischemia as the trigger guides urgent interventions like nitroglycerin to restore blood flow.
Question 2
Which hypersensitivity reaction is associated with anaphylaxis after a bee sting?
A) Type II (Cytotoxic)
B) Type I (Allergic/IgE-mediated)
C) Type III (Immune complex)
D) Type IV (Cell-mediated)
Correct Answer: B
Explanation: Type I hypersensitivity involves IgE-mediated release of histamine and other
mediators, causing immediate reactions like anaphylaxis (e.g., swollen lips, throat tightness,
shortness of breath after a bee sting). Type II (A) involves IgG/IgM targeting specific cells (e.g.,
hemolysis). Type III (C) involves immune complex deposition (e.g., lupus). Type IV (D) is
delayed, cell-mediated (e.g., contact dermatitis). Clinical Reasoning: Rapid recognition of Type
I hypersensitivity prompts epinephrine administration to reverse anaphylaxis.
, 2
Question 3
A patient with chronic kidney disease presents with elevated serum creatinine. What is the
primary pathophysiological cause?
A) Increased glomerular filtration rate
B) Decreased nephron function
C) Excessive tubular reabsorption
D) Reduced renal artery perfusion
Correct Answer: B
Explanation: Elevated serum creatinine results from decreased nephron function, reducing the
kidneys’ ability to filter and excrete waste. This is common in chronic kidney disease due to
progressive nephron loss. Increased glomerular filtration rate (A) would lower creatinine.
Excessive reabsorption (C) does not directly cause creatinine elevation. Reduced perfusion (D)
may contribute but is secondary to nephron loss. Clinical Reasoning: Monitoring creatinine
guides staging of kidney disease and treatment planning.
Question 4
What is the most abundant plasma protein?
A) Globulin
B) Albumin
C) Clotting factors
D) Complement proteins
Correct Answer: B
Explanation: Albumin, comprising about 60% of total plasma protein (approximately 4 g/dL),
maintains oncotic pressure and transports substances. Globulin (A) includes antibodies but is less
abundant. Clotting factors (C) and complement proteins (D) have specific roles but lower
concentrations. Clinical Reasoning: Low albumin levels may indicate liver dysfunction or
malnutrition, impacting fluid balance and drug transport.
Question 5
A patient with asthma exhibits wheezing and dyspnea. What is the primary pathophysiological
mechanism?
A) Alveolar destruction
B) Bronchoconstriction
C) Pulmonary edema
D) Pleural effusion
Correct Answer: B
Explanation: Asthma is characterized by reversible bronchoconstriction due to airway
inflammation and hyperresponsiveness, causing wheezing and dyspnea. Alveolar destruction (A)
is seen in emphysema. Pulmonary edema (C) results from fluid overload, typically in heart
, 3
failure. Pleural effusion (D) involves fluid in the pleural space, not airways. Clinical Reasoning:
Bronchodilators (e.g., albuterol) target bronchoconstriction to relieve symptoms.
Question 6
Which condition is most likely to cause right heart failure due to elevated pulmonary vascular
resistance?
A) Left heart failure
B) Pulmonary disease
C) Systemic hypertension
D) Aortic stenosis
Correct Answer: B
Explanation: Pulmonary diseases (e.g., COPD, pulmonary hypertension) increase pulmonary
vascular resistance, forcing the right ventricle to work harder, leading to right heart failure. Left
heart failure (A) causes pulmonary edema but not primarily right-sided failure. Systemic
hypertension (C) affects the left heart. Aortic stenosis (D) increases left ventricular pressure.
Clinical Reasoning: Identifying right heart failure prompts evaluation of pulmonary causes to
guide treatment.
Question 7
A patient presents with sudden palpitations, shakiness, and blood pressure of 210/105 mmHg.
What diagnosis is most likely?
A) Myxedema coma
B) Addison’s disease
C) Thyrotoxicosis
D) Pheochromocytoma
Correct Answer: D
Explanation: Pheochromocytoma, a catecholamine-secreting adrenal tumor, causes episodic
hypertension, palpitations, and shakiness due to excess norepinephrine and epinephrine.
Myxedema coma (A) presents with hypothermia and lethargy. Addison’s disease (B) causes
hypotension and fatigue. Thyrotoxicosis (C) may cause palpitations but typically with weight
loss and heat intolerance. Clinical Reasoning: Suspecting pheochromocytoma prompts
catecholamine testing and imaging.
Question 8
What is the purpose of the spirometry measurement in a patient with suspected COPD?
A) Evaluate the cause of hypoxia
B) Measure volume and flow rate during forced expiration
