Fall Semester 2026–2027 RASMUSSEN NUR2063 Essentials of Pathophysiology
Updated 2026 | 190+ Questions and Answers | Rasmussen University
Pathophysiology Study Guide, Practice Exam, Comprehensive Review, Exam Prep
Test Bank, Cellular Adaptation, Inflammation, Immune Disorders, Cardiovascular
Disorders, Respiratory Diseases, Endocrine Disorders, Renal Conditions,
Neurological Disorders, Detailed Rationales and Complete Revision Material
Question 1: A 72-year-old male with a history of hypertension presents with a
sudden onset of severe, tearing chest pain that radiates to his back. His blood
pressure is 180/110 mmHg in his right arm and 100/60 mmHg in his left arm. Which
of the following pathophysiological processes is the most likely cause of his
presentation?
A. Rupture of an atherosclerotic plaque in the coronary artery
B. Acute dissection of the thoracic aorta
C. Pulmonary embolism occluding the main pulmonary artery
D. Esophageal rupture following severe retching
CORRECT ANSWER: B. Acute dissection of the thoracic aorta
Rationale: The patient's presentation of sudden, severe, tearing chest pain radiating to
the back, along with a significant blood pressure differential between arms, is classic
for an acute aortic dissection. This condition occurs when a tear in the intimal layer of
the aorta allows blood to enter the media, creating a false lumen that can extend and
compromise branch vessels, leading to pulse or blood pressure deficits.
Question 2: A patient with chronic obstructive pulmonary disease (COPD) has a
PaCO2 of 55 mmHg and a pH of 7.30. Which of the following compensatory
mechanisms is primarily responsible for maintaining his acid-base balance over
the next 24-48 hours?
A. Increased renal excretion of bicarbonate
B. Increased renal reabsorption of bicarbonate
C. Hyperventilation to blow off more CO2
D. Increased production of lactic acid
CORRECT ANSWER: B. Increased renal reabsorption of bicarbonate
Rationale: The patient has chronic respiratory acidosis due to COPD. The primary
compensation for a respiratory acid-base imbalance is metabolic. The kidneys respond
by increasing the reabsorption of bicarbonate (HCO3-) and excreting hydrogen ions (H+)
to buffer the acidosis, which is a process that takes several days to become fully
effective.
Question 3: A 55-year-old female presents with fatigue, weight gain, cold
intolerance, and constipation. Laboratory results show elevated TSH and low free
T4 levels. What is the most likely underlying pathophysiological mechanism for her
condition?
,A. Excessive production of thyroid hormone by a thyroid nodule
B. Autoimmune destruction of the thyroid gland
C. Hypersecretion of TRH from the hypothalamus
D. Resistance of peripheral tissues to thyroid hormone
CORRECT ANSWER: B. Autoimmune destruction of the thyroid gland
Rationale: The patient's signs and symptoms (fatigue, weight gain, cold intolerance)
along with lab results (elevated TSH, low free T4) are classic for primary hypothyroidism.
The most common cause in the U.S. is Hashimoto's thyroiditis, an autoimmune disorder
where the immune system attacks and destroys the thyroid gland, leading to decreased
hormone production and a compensatory rise in TSH.
Question 4: In a patient with septic shock, which of the following vascular changes
is the primary cause of the profound hypotension?
A. Massive vasoconstriction leading to increased systemic vascular resistance
B. Increased capillary permeability and fluid shifting into the interstitial space
C. Systemic vasodilation leading to a dramatic drop in systemic vascular resistance
D. Decreased cardiac contractility due to myocardial depressant factors
CORRECT ANSWER: C. Systemic vasodilation leading to a dramatic drop in
systemic vascular resistance
Rationale: The hallmark of septic shock is profound systemic vasodilation caused by
the massive release of inflammatory mediators (e.g., nitric oxide, prostaglandins). This
vasodilation results in a significant decrease in systemic vascular resistance (SVR),
leading to hypotension despite a normal or even elevated cardiac output (warm shock).
Question 5: A patient with a history of type 1 diabetes mellitus is found
unresponsive. His breath has a fruity odor, and his skin is dry. An arterial blood gas
shows a pH of 7.1 and a bicarbonate level of 10 mEq/L. What is the primary
mechanism for the development of this acidosis?
A. Increased renal excretion of bicarbonate
B. Accumulation of lactic acid due to poor tissue perfusion
C. Excessive loss of bicarbonate from severe diarrhea
D. Unchecked ketogenesis due to insulin deficiency
CORRECT ANSWER: D. Unchecked ketogenesis due to insulin deficiency
Rationale: The patient is presenting with diabetic ketoacidosis (DKA). In the absence of
insulin, the body cannot utilize glucose, leading to increased lipolysis. The breakdown
of fatty acids in the liver produces ketone bodies (acetoacetate, beta-hydroxybutyrate),
which are strong acids that overwhelm the buffering system, causing a metabolic
acidosis.
,Question 6: A patient with liver cirrhosis develops ascites. Which of the following
pathophysiological mechanisms is the primary contributor to the formation of
ascitic fluid?
A. Increased hydrostatic pressure in the portal venous system
B. Decreased production of albumin leading to low plasma oncotic pressure
C. Increased lymphatic obstruction from fibrotic changes
D. Hyperaldosteronism due to decreased liver metabolism
CORRECT ANSWER: A. Increased hydrostatic pressure in the portal venous system
Rationale: While hypoalbuminemia and hyperaldosteronism contribute, the primary
mechanism for ascites in cirrhosis is portal hypertension. The cirrhotic liver causes
increased resistance to blood flow through the portal vein, leading to increased
hydrostatic pressure in the splanchnic capillaries, which forces fluid into the peritoneal
cavity.
Question 7: A 65-year-old smoker presents with hemoptysis and weight loss. A
chest X-ray reveals a hilar mass. Biopsy shows small, dark blue, oval cells with
scant cytoplasm. What specific paraneoplastic syndrome is most commonly
associated with this type of lung cancer?
A. Hypercalcemia
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
C. Hypertrophic pulmonary osteoarthropathy
D. Gynecomastia
CORRECT ANSWER: B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Rationale: The biopsy results are consistent with small cell lung carcinoma (SCLC).
SCLC is a neuroendocrine tumor that is highly associated with paraneoplastic
syndromes, most commonly SIADH, where ectopic production of ADH leads to
hyponatremia. Hypercalcemia is more commonly associated with squamous cell lung
cancer.
Question 8: In the early stages of acute kidney injury (AKI) due to prerenal
azotemia, which of the following findings is most indicative of the intrinsic ability of
the kidneys to compensate?
A. High urine sodium concentration (>40 mEq/L)
B. Low urine osmolality (<300 mOsm/kg)
C. High BUN-to-creatinine ratio (>20:1)
D. Presence of muddy brown casts in the urine
CORRECT ANSWER: C. High BUN-to-creatinine ratio (>20:1)
Rationale: In prerenal azotemia, the kidneys are structurally normal but are
hypoperfused. The intact kidneys respond by avidly reabsorbing sodium and water, and
by increasing urea reabsorption. This leads to a disproportionate rise in BUN compared
, to creatinine, resulting in a BUN/Cr ratio > 20:1. Low urine sodium (<20 mEq/L) and high
urine osmolality (>500 mOsm) are also classic findings.
Question 9: A 68-year-old man presents with progressive difficulty walking and
urinary incontinence. An MRI shows an enlarged prostate. Which of the following
best describes the pathogenesis of his condition?
A. Adenocarcinoma arising from the peripheral zone of the prostate
B. Benign hyperplasia of the transitional zone of the prostate
C. Chronic inflammation of the prostate gland (prostatitis)
D. Fibrosis of the urethra due to repeated infections
CORRECT ANSWER: B. Benign hyperplasia of the transitional zone of the prostate
Rationale: This patient is presenting with symptoms of benign prostatic hyperplasia
(BPH), which typically involves the transitional zone of the prostate. The hyperplasia is
driven by the conversion of testosterone to dihydrotestosterone (DHT) by 5-alpha-
reductase, leading to increased cell proliferation. This enlargement can compress the
urethra, causing obstructive symptoms like difficulty voiding and, in severe cases,
urinary retention leading to overflow incontinence.
Question 10: A patient with sickle cell disease is in a vaso-occlusive crisis. What is
the primary molecular event that triggers the sickling of red blood cells?
A. Decreased production of 2,3-DPG
B. Polymerization of hemoglobin S in the deoxygenated state
C. Binding of oxygen to hemoglobin S with high affinity
D. Increased fragility of the red blood cell membrane
CORRECT ANSWER: B. Polymerization of hemoglobin S in the deoxygenated state
Rationale: Sickle cell disease is caused by a point mutation in the beta-globin gene (Glu
to Val). Under conditions of low oxygen tension (deoxygenation), the abnormal
hemoglobin S molecules polymerize into long, rigid rods. These polymers distort the red
blood cell into a sickle shape, causing them to become rigid and occlude small blood
vessels.
Question 11: A patient with a ruptured spleen from a motor vehicle accident is in
hemorrhagic shock. Which of the following compensatory mechanisms is most
critical for maintaining blood pressure in the immediate minutes following the
injury?
A. Renal retention of sodium and water
B. Peripheral vasoconstriction mediated by the sympathetic nervous system
C. Increased cardiac contractility from the Frank-Starling mechanism
D. Activation of the renin-angiotensin-aldosterone system (RAAS)
CORRECT ANSWER: B. Peripheral vasoconstriction mediated by the sympathetic
nervous system
Updated 2026 | 190+ Questions and Answers | Rasmussen University
Pathophysiology Study Guide, Practice Exam, Comprehensive Review, Exam Prep
Test Bank, Cellular Adaptation, Inflammation, Immune Disorders, Cardiovascular
Disorders, Respiratory Diseases, Endocrine Disorders, Renal Conditions,
Neurological Disorders, Detailed Rationales and Complete Revision Material
Question 1: A 72-year-old male with a history of hypertension presents with a
sudden onset of severe, tearing chest pain that radiates to his back. His blood
pressure is 180/110 mmHg in his right arm and 100/60 mmHg in his left arm. Which
of the following pathophysiological processes is the most likely cause of his
presentation?
A. Rupture of an atherosclerotic plaque in the coronary artery
B. Acute dissection of the thoracic aorta
C. Pulmonary embolism occluding the main pulmonary artery
D. Esophageal rupture following severe retching
CORRECT ANSWER: B. Acute dissection of the thoracic aorta
Rationale: The patient's presentation of sudden, severe, tearing chest pain radiating to
the back, along with a significant blood pressure differential between arms, is classic
for an acute aortic dissection. This condition occurs when a tear in the intimal layer of
the aorta allows blood to enter the media, creating a false lumen that can extend and
compromise branch vessels, leading to pulse or blood pressure deficits.
Question 2: A patient with chronic obstructive pulmonary disease (COPD) has a
PaCO2 of 55 mmHg and a pH of 7.30. Which of the following compensatory
mechanisms is primarily responsible for maintaining his acid-base balance over
the next 24-48 hours?
A. Increased renal excretion of bicarbonate
B. Increased renal reabsorption of bicarbonate
C. Hyperventilation to blow off more CO2
D. Increased production of lactic acid
CORRECT ANSWER: B. Increased renal reabsorption of bicarbonate
Rationale: The patient has chronic respiratory acidosis due to COPD. The primary
compensation for a respiratory acid-base imbalance is metabolic. The kidneys respond
by increasing the reabsorption of bicarbonate (HCO3-) and excreting hydrogen ions (H+)
to buffer the acidosis, which is a process that takes several days to become fully
effective.
Question 3: A 55-year-old female presents with fatigue, weight gain, cold
intolerance, and constipation. Laboratory results show elevated TSH and low free
T4 levels. What is the most likely underlying pathophysiological mechanism for her
condition?
,A. Excessive production of thyroid hormone by a thyroid nodule
B. Autoimmune destruction of the thyroid gland
C. Hypersecretion of TRH from the hypothalamus
D. Resistance of peripheral tissues to thyroid hormone
CORRECT ANSWER: B. Autoimmune destruction of the thyroid gland
Rationale: The patient's signs and symptoms (fatigue, weight gain, cold intolerance)
along with lab results (elevated TSH, low free T4) are classic for primary hypothyroidism.
The most common cause in the U.S. is Hashimoto's thyroiditis, an autoimmune disorder
where the immune system attacks and destroys the thyroid gland, leading to decreased
hormone production and a compensatory rise in TSH.
Question 4: In a patient with septic shock, which of the following vascular changes
is the primary cause of the profound hypotension?
A. Massive vasoconstriction leading to increased systemic vascular resistance
B. Increased capillary permeability and fluid shifting into the interstitial space
C. Systemic vasodilation leading to a dramatic drop in systemic vascular resistance
D. Decreased cardiac contractility due to myocardial depressant factors
CORRECT ANSWER: C. Systemic vasodilation leading to a dramatic drop in
systemic vascular resistance
Rationale: The hallmark of septic shock is profound systemic vasodilation caused by
the massive release of inflammatory mediators (e.g., nitric oxide, prostaglandins). This
vasodilation results in a significant decrease in systemic vascular resistance (SVR),
leading to hypotension despite a normal or even elevated cardiac output (warm shock).
Question 5: A patient with a history of type 1 diabetes mellitus is found
unresponsive. His breath has a fruity odor, and his skin is dry. An arterial blood gas
shows a pH of 7.1 and a bicarbonate level of 10 mEq/L. What is the primary
mechanism for the development of this acidosis?
A. Increased renal excretion of bicarbonate
B. Accumulation of lactic acid due to poor tissue perfusion
C. Excessive loss of bicarbonate from severe diarrhea
D. Unchecked ketogenesis due to insulin deficiency
CORRECT ANSWER: D. Unchecked ketogenesis due to insulin deficiency
Rationale: The patient is presenting with diabetic ketoacidosis (DKA). In the absence of
insulin, the body cannot utilize glucose, leading to increased lipolysis. The breakdown
of fatty acids in the liver produces ketone bodies (acetoacetate, beta-hydroxybutyrate),
which are strong acids that overwhelm the buffering system, causing a metabolic
acidosis.
,Question 6: A patient with liver cirrhosis develops ascites. Which of the following
pathophysiological mechanisms is the primary contributor to the formation of
ascitic fluid?
A. Increased hydrostatic pressure in the portal venous system
B. Decreased production of albumin leading to low plasma oncotic pressure
C. Increased lymphatic obstruction from fibrotic changes
D. Hyperaldosteronism due to decreased liver metabolism
CORRECT ANSWER: A. Increased hydrostatic pressure in the portal venous system
Rationale: While hypoalbuminemia and hyperaldosteronism contribute, the primary
mechanism for ascites in cirrhosis is portal hypertension. The cirrhotic liver causes
increased resistance to blood flow through the portal vein, leading to increased
hydrostatic pressure in the splanchnic capillaries, which forces fluid into the peritoneal
cavity.
Question 7: A 65-year-old smoker presents with hemoptysis and weight loss. A
chest X-ray reveals a hilar mass. Biopsy shows small, dark blue, oval cells with
scant cytoplasm. What specific paraneoplastic syndrome is most commonly
associated with this type of lung cancer?
A. Hypercalcemia
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
C. Hypertrophic pulmonary osteoarthropathy
D. Gynecomastia
CORRECT ANSWER: B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Rationale: The biopsy results are consistent with small cell lung carcinoma (SCLC).
SCLC is a neuroendocrine tumor that is highly associated with paraneoplastic
syndromes, most commonly SIADH, where ectopic production of ADH leads to
hyponatremia. Hypercalcemia is more commonly associated with squamous cell lung
cancer.
Question 8: In the early stages of acute kidney injury (AKI) due to prerenal
azotemia, which of the following findings is most indicative of the intrinsic ability of
the kidneys to compensate?
A. High urine sodium concentration (>40 mEq/L)
B. Low urine osmolality (<300 mOsm/kg)
C. High BUN-to-creatinine ratio (>20:1)
D. Presence of muddy brown casts in the urine
CORRECT ANSWER: C. High BUN-to-creatinine ratio (>20:1)
Rationale: In prerenal azotemia, the kidneys are structurally normal but are
hypoperfused. The intact kidneys respond by avidly reabsorbing sodium and water, and
by increasing urea reabsorption. This leads to a disproportionate rise in BUN compared
, to creatinine, resulting in a BUN/Cr ratio > 20:1. Low urine sodium (<20 mEq/L) and high
urine osmolality (>500 mOsm) are also classic findings.
Question 9: A 68-year-old man presents with progressive difficulty walking and
urinary incontinence. An MRI shows an enlarged prostate. Which of the following
best describes the pathogenesis of his condition?
A. Adenocarcinoma arising from the peripheral zone of the prostate
B. Benign hyperplasia of the transitional zone of the prostate
C. Chronic inflammation of the prostate gland (prostatitis)
D. Fibrosis of the urethra due to repeated infections
CORRECT ANSWER: B. Benign hyperplasia of the transitional zone of the prostate
Rationale: This patient is presenting with symptoms of benign prostatic hyperplasia
(BPH), which typically involves the transitional zone of the prostate. The hyperplasia is
driven by the conversion of testosterone to dihydrotestosterone (DHT) by 5-alpha-
reductase, leading to increased cell proliferation. This enlargement can compress the
urethra, causing obstructive symptoms like difficulty voiding and, in severe cases,
urinary retention leading to overflow incontinence.
Question 10: A patient with sickle cell disease is in a vaso-occlusive crisis. What is
the primary molecular event that triggers the sickling of red blood cells?
A. Decreased production of 2,3-DPG
B. Polymerization of hemoglobin S in the deoxygenated state
C. Binding of oxygen to hemoglobin S with high affinity
D. Increased fragility of the red blood cell membrane
CORRECT ANSWER: B. Polymerization of hemoglobin S in the deoxygenated state
Rationale: Sickle cell disease is caused by a point mutation in the beta-globin gene (Glu
to Val). Under conditions of low oxygen tension (deoxygenation), the abnormal
hemoglobin S molecules polymerize into long, rigid rods. These polymers distort the red
blood cell into a sickle shape, causing them to become rigid and occlude small blood
vessels.
Question 11: A patient with a ruptured spleen from a motor vehicle accident is in
hemorrhagic shock. Which of the following compensatory mechanisms is most
critical for maintaining blood pressure in the immediate minutes following the
injury?
A. Renal retention of sodium and water
B. Peripheral vasoconstriction mediated by the sympathetic nervous system
C. Increased cardiac contractility from the Frank-Starling mechanism
D. Activation of the renin-angiotensin-aldosterone system (RAAS)
CORRECT ANSWER: B. Peripheral vasoconstriction mediated by the sympathetic
nervous system
