Rasmussen NUR2063 Pathophysiology Updated 2026 | Comprehensive
Study Guide, Practice Exam Questions and Answers, Exam Prep Test
Bank, Disease Processes and Mechanisms, Cellular Adaptation and Injury,
Inflammation and Immune Response, Fluid and Electrolyte Imbalances,
Genetic Disorders, Multisystem Pathophysiology Concepts, Clinical
Manifestations, and Detailed Rationales for Nursing Exam Success
Question 1: A 65-year-old male with a history of hypertension presents with a
sudden onset of severe chest pain that radiates to his back. A contrast-enhanced
CT scan reveals an intimal flap in the descending thoracic aorta. Which of the
following best describes the underlying pathophysiology of this condition?
A. Weakening of the arterial wall due to atherosclerotic plaque rupture
B. Acute dilation of the venous system leading to backflow
C. A tear in the intimal layer allowing blood to enter the media
D. Obstruction of the coronary arteries by an embolus
CORRECT ANSWER: C. A tear in the intimal layer allowing blood to enter the media
Rationale: The patient's presentation is classic for an aortic dissection. The
pathophysiology involves a tear in the intimal lining of the aorta, which allows blood to
enter the medial layer, creating a false lumen. This can propagate along the aorta,
leading to malperfusion or rupture. Option A describes plaque rupture leading to acute
coronary syndrome, not dissection. Option B is incorrect as it describes venous issues,
and Option D describes an embolic event, not the primary mechanism of dissection.
Question 2: A patient with chronic obstructive pulmonary disease (COPD) has a
prolonged expiratory phase and a barrel-shaped chest. These findings are a direct
result of which pathophysiological mechanism?
A. Excessive mucus production obstructing the large airways only
B. Destruction of alveolar walls and loss of elastic recoil
C. Hypertrophy of the bronchial smooth muscle
D. Increased production of surfactant
CORRECT ANSWER: B. Destruction of alveolar walls and loss of elastic recoil
Rationale: In COPD, specifically emphysema, there is destruction of the alveolar walls
and a loss of elastic recoil. This leads to air trapping, hyperinflation, and the classic
barrel-shaped chest. The loss of elastic recoil also contributes to airflow limitation,
especially during expiration, resulting in a prolonged expiratory phase. Option A is more
characteristic of chronic bronchitis. Option C is seen in asthma. Option D is incorrect
as surfactant production is typically reduced or normal, not increased.
,Question 3: A patient with type 1 diabetes mellitus is found to have an elevated
serum potassium level (6.5 mEq/L) despite a total body potassium deficit. Which of
the following best explains this laboratory finding?
A. Increased renal excretion of potassium
B. Insulin deficiency causing potassium to shift out of cells
C. Aldosterone excess promoting potassium retention
D. Increased intracellular uptake of potassium
CORRECT ANSWER: B. Insulin deficiency causing potassium to shift out of cells
Rationale: Insulin promotes the intracellular uptake of potassium. In type 1 diabetes,
insulin deficiency allows potassium to shift from the intracellular to the extracellular
compartment, causing hyperkalemia despite a total body deficit. Option A would lower
serum potassium. Option C (aldosterone excess) promotes potassium excretion, not
retention. Option D would lower serum potassium.
Question 4: A patient with liver cirrhosis develops ascites and peripheral edema.
What is the primary pathophysiological mechanism contributing to this fluid
accumulation?
A. Increased plasma oncotic pressure from hyperalbuminemia
B. Decreased hepatic synthesis of albumin leading to reduced oncotic pressure
C. Increased lymphatic drainage from the liver
D. Increased glomerular filtration rate
CORRECT ANSWER: B. Decreased hepatic synthesis of albumin leading to reduced
oncotic pressure
Rationale: The liver synthesizes albumin. In cirrhosis, liver function is impaired, leading
to decreased albumin production. This results in reduced plasma oncotic pressure,
which causes fluid to leak from the intravascular space into the interstitial space,
leading to ascites and edema. Option A is incorrect as oncotic pressure is decreased,
not increased. Option C is incorrect as lymphatic drainage is often impaired. Option D is
incorrect as GFR is often decreased in advanced liver disease.
Question 5: A patient presents with a sudden onset of severe, unilateral headache,
photophobia, and nuchal rigidity. A lumbar puncture reveals bloody cerebrospinal
fluid. Which of the following is the most likely diagnosis?
A. Bacterial meningitis
B. Subarachnoid hemorrhage
C. Migraine headache
D. Brain abscess
CORRECT ANSWER: B. Subarachnoid hemorrhage
,Rationale: The classic triad of a sudden severe headache, nuchal rigidity, and
photophobia, coupled with bloody cerebrospinal fluid (CSF) on a lumbar puncture, is
highly indicative of a subarachnoid hemorrhage (SAH). The blood in the subarachnoid
space causes meningeal irritation. Option A would show cloudy CSF with elevated
white cells. Option C typically has clear CSF. Option D would show a space-occupying
lesion on imaging but not necessarily bloody CSF.
Question 6: A patient with chronic kidney disease has a hemoglobin level of 8.5
g/dL. This anemia is most likely due to a deficiency in which of the following?
A. Vitamin B12
B. Folic acid
C. Erythropoietin
D. Iron
CORRECT ANSWER: C. Erythropoietin
Rationale: The kidneys are the primary site of erythropoietin (EPO) production. In
chronic kidney disease (CKD), the damaged kidneys cannot produce adequate amounts
of EPO, leading to a normochromic, normocytic anemia. Options A, B, and D are causes
of other types of anemia (macrocytic and microcytic) but are not the primary cause of
anemia in CKD.
Question 7: A patient is diagnosed with a pulmonary embolism. This condition
directly impairs gas exchange primarily by which mechanism?
A. Increasing alveolar surface area for diffusion
B. Creating a ventilation-perfusion (V/Q) mismatch
C. Decreasing airway resistance
D. Increasing surfactant production
CORRECT ANSWER: B. Creating a ventilation-perfusion (V/Q) mismatch
Rationale: A pulmonary embolism (PE) obstructs blood flow to a segment of the lung.
The alveoli in that area remain ventilated but are not perfused, leading to a high V/Q
ratio and a dead space. This V/Q mismatch is the primary cause of the gas exchange
impairment and hypoxemia seen in PE. Option A is incorrect as PE decreases perfusion,
not surface area. Option C is incorrect; PE does not decrease airway resistance. Option
D is incorrect.
Question 8: A patient with severe vomiting for three days presents with lethargy,
confusion, and deep, rapid respirations. An arterial blood gas shows pH 7.30,
HCO3- 14 mEq/L, and PaCO2 30 mmHg. This acid-base imbalance is best described
as:
, A. Metabolic acidosis with partial respiratory compensation
B. Metabolic alkalosis with respiratory compensation
C. Respiratory acidosis with metabolic compensation
D. Respiratory alkalosis with metabolic compensation
CORRECT ANSWER: A. Metabolic acidosis with partial respiratory compensation
Rationale: The low pH (7.30) indicates acidemia. The low bicarbonate (14 mEq/L)
indicates a metabolic acidosis. The PaCO2 is low (30 mmHg), which is a compensatory
respiratory response (hyperventilation) to blow off CO2. Since the PaCO2 is not low
enough to fully compensate (expected PaCO2 ≈ 1.5 x HCO3 + 8 = 29 mmHg), it is
described as partial compensation. Option B is incorrect due to the low pH. Options C
and D are incorrect because the primary imbalance is metabolic, not respiratory.
Question 9: A patient with a history of asthma is experiencing an acute
exacerbation. Which of the following best describes the primary cause of airway
obstruction during this exacerbation?
A. Collapse of the large airways due to loss of cartilage
B. Bronchoconstriction, inflammation, and mucus plugging
C. Fibrosis and scarring of the lung parenchyma
D. Pulmonary hypertension leading to edema
CORRECT ANSWER: B. Bronchoconstriction, inflammation, and mucus plugging
Rationale: Asthma is characterized by chronic airway inflammation, which leads to
bronchial hyperresponsiveness. During an exacerbation, this triggers
bronchoconstriction, increased mucus secretion, and airway edema, all of which
contribute to reversible airway obstruction. Option A describes tracheomalacia. Option
C describes interstitial lung disease. Option D describes a complication of other
conditions, not the primary cause of obstruction in asthma.
Question 10: A 50-year-old female reports fatigue, weight gain, constipation, and
cold intolerance. Laboratory results show a low T3 and T4 level with a markedly
elevated TSH. These findings are consistent with which of the following?
A. Secondary hypothyroidism
B. Primary hypothyroidism
C. Tertiary hypothyroidism
D. Euthyroid sick syndrome
CORRECT ANSWER: B. Primary hypothyroidism
Rationale: Primary hypothyroidism is characterized by pathology in the thyroid gland
itself, leading to low production of T3 and T4. The low thyroid hormone levels result in
the loss of negative feedback inhibition on the anterior pituitary, which then produces
Study Guide, Practice Exam Questions and Answers, Exam Prep Test
Bank, Disease Processes and Mechanisms, Cellular Adaptation and Injury,
Inflammation and Immune Response, Fluid and Electrolyte Imbalances,
Genetic Disorders, Multisystem Pathophysiology Concepts, Clinical
Manifestations, and Detailed Rationales for Nursing Exam Success
Question 1: A 65-year-old male with a history of hypertension presents with a
sudden onset of severe chest pain that radiates to his back. A contrast-enhanced
CT scan reveals an intimal flap in the descending thoracic aorta. Which of the
following best describes the underlying pathophysiology of this condition?
A. Weakening of the arterial wall due to atherosclerotic plaque rupture
B. Acute dilation of the venous system leading to backflow
C. A tear in the intimal layer allowing blood to enter the media
D. Obstruction of the coronary arteries by an embolus
CORRECT ANSWER: C. A tear in the intimal layer allowing blood to enter the media
Rationale: The patient's presentation is classic for an aortic dissection. The
pathophysiology involves a tear in the intimal lining of the aorta, which allows blood to
enter the medial layer, creating a false lumen. This can propagate along the aorta,
leading to malperfusion or rupture. Option A describes plaque rupture leading to acute
coronary syndrome, not dissection. Option B is incorrect as it describes venous issues,
and Option D describes an embolic event, not the primary mechanism of dissection.
Question 2: A patient with chronic obstructive pulmonary disease (COPD) has a
prolonged expiratory phase and a barrel-shaped chest. These findings are a direct
result of which pathophysiological mechanism?
A. Excessive mucus production obstructing the large airways only
B. Destruction of alveolar walls and loss of elastic recoil
C. Hypertrophy of the bronchial smooth muscle
D. Increased production of surfactant
CORRECT ANSWER: B. Destruction of alveolar walls and loss of elastic recoil
Rationale: In COPD, specifically emphysema, there is destruction of the alveolar walls
and a loss of elastic recoil. This leads to air trapping, hyperinflation, and the classic
barrel-shaped chest. The loss of elastic recoil also contributes to airflow limitation,
especially during expiration, resulting in a prolonged expiratory phase. Option A is more
characteristic of chronic bronchitis. Option C is seen in asthma. Option D is incorrect
as surfactant production is typically reduced or normal, not increased.
,Question 3: A patient with type 1 diabetes mellitus is found to have an elevated
serum potassium level (6.5 mEq/L) despite a total body potassium deficit. Which of
the following best explains this laboratory finding?
A. Increased renal excretion of potassium
B. Insulin deficiency causing potassium to shift out of cells
C. Aldosterone excess promoting potassium retention
D. Increased intracellular uptake of potassium
CORRECT ANSWER: B. Insulin deficiency causing potassium to shift out of cells
Rationale: Insulin promotes the intracellular uptake of potassium. In type 1 diabetes,
insulin deficiency allows potassium to shift from the intracellular to the extracellular
compartment, causing hyperkalemia despite a total body deficit. Option A would lower
serum potassium. Option C (aldosterone excess) promotes potassium excretion, not
retention. Option D would lower serum potassium.
Question 4: A patient with liver cirrhosis develops ascites and peripheral edema.
What is the primary pathophysiological mechanism contributing to this fluid
accumulation?
A. Increased plasma oncotic pressure from hyperalbuminemia
B. Decreased hepatic synthesis of albumin leading to reduced oncotic pressure
C. Increased lymphatic drainage from the liver
D. Increased glomerular filtration rate
CORRECT ANSWER: B. Decreased hepatic synthesis of albumin leading to reduced
oncotic pressure
Rationale: The liver synthesizes albumin. In cirrhosis, liver function is impaired, leading
to decreased albumin production. This results in reduced plasma oncotic pressure,
which causes fluid to leak from the intravascular space into the interstitial space,
leading to ascites and edema. Option A is incorrect as oncotic pressure is decreased,
not increased. Option C is incorrect as lymphatic drainage is often impaired. Option D is
incorrect as GFR is often decreased in advanced liver disease.
Question 5: A patient presents with a sudden onset of severe, unilateral headache,
photophobia, and nuchal rigidity. A lumbar puncture reveals bloody cerebrospinal
fluid. Which of the following is the most likely diagnosis?
A. Bacterial meningitis
B. Subarachnoid hemorrhage
C. Migraine headache
D. Brain abscess
CORRECT ANSWER: B. Subarachnoid hemorrhage
,Rationale: The classic triad of a sudden severe headache, nuchal rigidity, and
photophobia, coupled with bloody cerebrospinal fluid (CSF) on a lumbar puncture, is
highly indicative of a subarachnoid hemorrhage (SAH). The blood in the subarachnoid
space causes meningeal irritation. Option A would show cloudy CSF with elevated
white cells. Option C typically has clear CSF. Option D would show a space-occupying
lesion on imaging but not necessarily bloody CSF.
Question 6: A patient with chronic kidney disease has a hemoglobin level of 8.5
g/dL. This anemia is most likely due to a deficiency in which of the following?
A. Vitamin B12
B. Folic acid
C. Erythropoietin
D. Iron
CORRECT ANSWER: C. Erythropoietin
Rationale: The kidneys are the primary site of erythropoietin (EPO) production. In
chronic kidney disease (CKD), the damaged kidneys cannot produce adequate amounts
of EPO, leading to a normochromic, normocytic anemia. Options A, B, and D are causes
of other types of anemia (macrocytic and microcytic) but are not the primary cause of
anemia in CKD.
Question 7: A patient is diagnosed with a pulmonary embolism. This condition
directly impairs gas exchange primarily by which mechanism?
A. Increasing alveolar surface area for diffusion
B. Creating a ventilation-perfusion (V/Q) mismatch
C. Decreasing airway resistance
D. Increasing surfactant production
CORRECT ANSWER: B. Creating a ventilation-perfusion (V/Q) mismatch
Rationale: A pulmonary embolism (PE) obstructs blood flow to a segment of the lung.
The alveoli in that area remain ventilated but are not perfused, leading to a high V/Q
ratio and a dead space. This V/Q mismatch is the primary cause of the gas exchange
impairment and hypoxemia seen in PE. Option A is incorrect as PE decreases perfusion,
not surface area. Option C is incorrect; PE does not decrease airway resistance. Option
D is incorrect.
Question 8: A patient with severe vomiting for three days presents with lethargy,
confusion, and deep, rapid respirations. An arterial blood gas shows pH 7.30,
HCO3- 14 mEq/L, and PaCO2 30 mmHg. This acid-base imbalance is best described
as:
, A. Metabolic acidosis with partial respiratory compensation
B. Metabolic alkalosis with respiratory compensation
C. Respiratory acidosis with metabolic compensation
D. Respiratory alkalosis with metabolic compensation
CORRECT ANSWER: A. Metabolic acidosis with partial respiratory compensation
Rationale: The low pH (7.30) indicates acidemia. The low bicarbonate (14 mEq/L)
indicates a metabolic acidosis. The PaCO2 is low (30 mmHg), which is a compensatory
respiratory response (hyperventilation) to blow off CO2. Since the PaCO2 is not low
enough to fully compensate (expected PaCO2 ≈ 1.5 x HCO3 + 8 = 29 mmHg), it is
described as partial compensation. Option B is incorrect due to the low pH. Options C
and D are incorrect because the primary imbalance is metabolic, not respiratory.
Question 9: A patient with a history of asthma is experiencing an acute
exacerbation. Which of the following best describes the primary cause of airway
obstruction during this exacerbation?
A. Collapse of the large airways due to loss of cartilage
B. Bronchoconstriction, inflammation, and mucus plugging
C. Fibrosis and scarring of the lung parenchyma
D. Pulmonary hypertension leading to edema
CORRECT ANSWER: B. Bronchoconstriction, inflammation, and mucus plugging
Rationale: Asthma is characterized by chronic airway inflammation, which leads to
bronchial hyperresponsiveness. During an exacerbation, this triggers
bronchoconstriction, increased mucus secretion, and airway edema, all of which
contribute to reversible airway obstruction. Option A describes tracheomalacia. Option
C describes interstitial lung disease. Option D describes a complication of other
conditions, not the primary cause of obstruction in asthma.
Question 10: A 50-year-old female reports fatigue, weight gain, constipation, and
cold intolerance. Laboratory results show a low T3 and T4 level with a markedly
elevated TSH. These findings are consistent with which of the following?
A. Secondary hypothyroidism
B. Primary hypothyroidism
C. Tertiary hypothyroidism
D. Euthyroid sick syndrome
CORRECT ANSWER: B. Primary hypothyroidism
Rationale: Primary hypothyroidism is characterized by pathology in the thyroid gland
itself, leading to low production of T3 and T4. The low thyroid hormone levels result in
the loss of negative feedback inhibition on the anterior pituitary, which then produces
