NUR 641EA Exam 1 V1 | NUR 641EA Advanced Pathophysiology and
Pharmacology for Nurse Educators | Actual Q&A with Rationale
(NUR641EA Exam 1) | Grand Canyon University
1. A 58-year-old male with a history of chronic hypertension presents with an enlarged heart
on a chest X-ray. The increase in the size of his left ventricle is primarily due to which cellular
adaptation?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: C
Rationale: Hypertrophy is defined as an increase in the size of individual cells, which in
turn leads to an increase in the size of the organ. In the heart, cardiomyocytes are
permanent cells that do not undergo division, so they adapt to increased workload by
increasing protein synthesis and organelle size. This process differs from hyperplasia,
which involves an increase in the number of cells through mitotic division.
2. During an ischemic event, the failure of the sodium-potassium (Na+/K+) pump leads to
which immediate cellular consequence?
A. Cellular swelling
B. Increased intracellular potassium
C. Cellular dehydration
D. Decreased intracellular calcium
Answer: A
Rationale: Ischemia causes a decrease in ATP production, which is necessary to fuel the
Na+/K+ pump. When the pump fails, sodium accumulates inside the cell, creating an
osmotic gradient that pulls water into the cytoplasm. This results in acute cellular swelling,
also known as oncosis, which is one of the earliest signs of cell injury.
3. A biopsy of the bronchial lining in a long-term smoker reveals that the normal ciliated
columnar epithelium has been replaced by stratified squamous epithelium. This is an
example of:
A. Atrophy
B. Dysplasia
,C. Metaplasia
D. Anaplasia
Answer: C
Rationale: Metaplasia is a reversible change in which one adult cell type is replaced by
another adult cell type to better withstand a harsh environment. In smokers, the fragile
ciliated columnar cells are replaced by tougher stratified squamous cells to survive chronic
irritation. While the new cells are more durable, they lack the protective secretory and
ciliary functions of the original tissue.
4. Which statement best describes the process of apoptosis compared to necrosis?
A. Apoptosis always results in an inflammatory response.
B. Apoptosis is a programmed cell death that prevents inflammation.
C. Apoptosis involves cellular rupture and leakage of enzymes.
D. Necrosis is a genetically regulated process for tissue remodeling.
Answer: B
Rationale: Apoptosis is a highly regulated ‘programmed’ cell death mechanism that
removes unwanted or damaged cells without spilling their contents into the extracellular
space. Because the cell membrane remains intact until phagocytosis occurs, there is
typically no inflammatory response associated with it. In contrast, necrosis is characterized
by membrane breakdown and the release of intracellular contents, which triggers a
localized inflammatory reaction.
5. A patient has a serum sodium level of 125 mEq/L. Which pathophysiological mechanism is
most likely responsible for the resulting neurological symptoms?
A. Water moving out of brain cells leading to shrinkage
B. Increased action potential firing due to high extracellular sodium
C. Water moving into brain cells causing cerebral edema
D. Decreased intracranial pressure due to fluid loss
Answer: C
Rationale: Hyponatremia occurs when the extracellular fluid becomes hypotonic relative
to the intracellular fluid. Water follows the osmotic gradient, moving from the blood into
the cells, which in the brain causes cerebral edema. The resulting increase in intracranial
pressure leads to symptoms such as headache, confusion, seizures, and potentially coma.
6. Which compensatory mechanism does the body use to correct a state of metabolic
acidosis?
A. Hyperventilation to decrease PCO2
, B. Hypoventilation to increase PCO2
C. Renal excretion of bicarbonate
D. Increased retention of hydrogen ions in the distal tubule
Answer: A
Rationale: In metabolic acidosis, the body attempts to raise the pH by reducing the amount
of acid in the blood through the respiratory system. The lungs increase the rate and depth
of respirations (Kussmaul breathing) to ‘blow off’ carbon dioxide, which reduces the
concentration of carbonic acid. This respiratory compensation acts quickly, though it
cannot fully correct the underlying metabolic cause.
7. A patient with chronic renal failure presents with a potassium level of 6.8 mEq/L. Which
ECG change should the nurse educator emphasize as a critical finding?
A. Peaked T waves
B. Shortened PR interval
C. Prominent U waves
D. ST-segment depression
Answer: A
Rationale: Hyperkalemia alters the cardiac cell membrane potential, specifically speeding
up repolarization. This physiological change manifests on the ECG as tall, peaked T-waves,
which are often the first sign of potassium toxicity. If the levels continue to rise, the QRS
complex will widen, and the heart may eventually enter ventricular fibrillation or asystole.
8. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
release of histamine from mast cells?
A. Type III
B. Type II
C. Type I
D. Type IV
Answer: C
Rationale: Type I hypersensitivity is an immediate allergic reaction mediated by IgE
antibodies that bind to mast cells. Upon re-exposure to an allergen, these mast cells
degranulate, releasing histamine and other inflammatory mediators. Common examples
include allergic rhinitis, asthma, and systemic anaphylaxis.
Pharmacology for Nurse Educators | Actual Q&A with Rationale
(NUR641EA Exam 1) | Grand Canyon University
1. A 58-year-old male with a history of chronic hypertension presents with an enlarged heart
on a chest X-ray. The increase in the size of his left ventricle is primarily due to which cellular
adaptation?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: C
Rationale: Hypertrophy is defined as an increase in the size of individual cells, which in
turn leads to an increase in the size of the organ. In the heart, cardiomyocytes are
permanent cells that do not undergo division, so they adapt to increased workload by
increasing protein synthesis and organelle size. This process differs from hyperplasia,
which involves an increase in the number of cells through mitotic division.
2. During an ischemic event, the failure of the sodium-potassium (Na+/K+) pump leads to
which immediate cellular consequence?
A. Cellular swelling
B. Increased intracellular potassium
C. Cellular dehydration
D. Decreased intracellular calcium
Answer: A
Rationale: Ischemia causes a decrease in ATP production, which is necessary to fuel the
Na+/K+ pump. When the pump fails, sodium accumulates inside the cell, creating an
osmotic gradient that pulls water into the cytoplasm. This results in acute cellular swelling,
also known as oncosis, which is one of the earliest signs of cell injury.
3. A biopsy of the bronchial lining in a long-term smoker reveals that the normal ciliated
columnar epithelium has been replaced by stratified squamous epithelium. This is an
example of:
A. Atrophy
B. Dysplasia
,C. Metaplasia
D. Anaplasia
Answer: C
Rationale: Metaplasia is a reversible change in which one adult cell type is replaced by
another adult cell type to better withstand a harsh environment. In smokers, the fragile
ciliated columnar cells are replaced by tougher stratified squamous cells to survive chronic
irritation. While the new cells are more durable, they lack the protective secretory and
ciliary functions of the original tissue.
4. Which statement best describes the process of apoptosis compared to necrosis?
A. Apoptosis always results in an inflammatory response.
B. Apoptosis is a programmed cell death that prevents inflammation.
C. Apoptosis involves cellular rupture and leakage of enzymes.
D. Necrosis is a genetically regulated process for tissue remodeling.
Answer: B
Rationale: Apoptosis is a highly regulated ‘programmed’ cell death mechanism that
removes unwanted or damaged cells without spilling their contents into the extracellular
space. Because the cell membrane remains intact until phagocytosis occurs, there is
typically no inflammatory response associated with it. In contrast, necrosis is characterized
by membrane breakdown and the release of intracellular contents, which triggers a
localized inflammatory reaction.
5. A patient has a serum sodium level of 125 mEq/L. Which pathophysiological mechanism is
most likely responsible for the resulting neurological symptoms?
A. Water moving out of brain cells leading to shrinkage
B. Increased action potential firing due to high extracellular sodium
C. Water moving into brain cells causing cerebral edema
D. Decreased intracranial pressure due to fluid loss
Answer: C
Rationale: Hyponatremia occurs when the extracellular fluid becomes hypotonic relative
to the intracellular fluid. Water follows the osmotic gradient, moving from the blood into
the cells, which in the brain causes cerebral edema. The resulting increase in intracranial
pressure leads to symptoms such as headache, confusion, seizures, and potentially coma.
6. Which compensatory mechanism does the body use to correct a state of metabolic
acidosis?
A. Hyperventilation to decrease PCO2
, B. Hypoventilation to increase PCO2
C. Renal excretion of bicarbonate
D. Increased retention of hydrogen ions in the distal tubule
Answer: A
Rationale: In metabolic acidosis, the body attempts to raise the pH by reducing the amount
of acid in the blood through the respiratory system. The lungs increase the rate and depth
of respirations (Kussmaul breathing) to ‘blow off’ carbon dioxide, which reduces the
concentration of carbonic acid. This respiratory compensation acts quickly, though it
cannot fully correct the underlying metabolic cause.
7. A patient with chronic renal failure presents with a potassium level of 6.8 mEq/L. Which
ECG change should the nurse educator emphasize as a critical finding?
A. Peaked T waves
B. Shortened PR interval
C. Prominent U waves
D. ST-segment depression
Answer: A
Rationale: Hyperkalemia alters the cardiac cell membrane potential, specifically speeding
up repolarization. This physiological change manifests on the ECG as tall, peaked T-waves,
which are often the first sign of potassium toxicity. If the levels continue to rise, the QRS
complex will widen, and the heart may eventually enter ventricular fibrillation or asystole.
8. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
release of histamine from mast cells?
A. Type III
B. Type II
C. Type I
D. Type IV
Answer: C
Rationale: Type I hypersensitivity is an immediate allergic reaction mediated by IgE
antibodies that bind to mast cells. Upon re-exposure to an allergen, these mast cells
degranulate, releasing histamine and other inflammatory mediators. Common examples
include allergic rhinitis, asthma, and systemic anaphylaxis.
