NUR 631 MIDTERM QUESTIONS AND ANSWERS - GCU | 100% VERIFIED | COMPLETE STUDY GUIDE
AND EXAM PREP QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
Cellular Adaptation, Injury, and Death
Genetics and Genetic Disorders
Fluid, Electrolyte, and Acid-Base Balance
Cardiovascular and Hematologic Pathophysiology
Pulmonary and Renal Pathophysiology
Neurological and Endocrine Dysfunction
Immunologic Pathophysiology and Inflammation
Gastrointestinal System Disorders
Introduction
The NUR 631 Midterm Examination assesses advanced-practice nursing knowledge in physiology and
pathophysiology at the graduate level. It evaluates the ability to analyze cellular mechanisms, genetic
influences, and systemic alterations that underlie disease processes. The examination employs multiple-
choice and scenario-based questions designed to measure clinical reasoning and decision-making.
Emphasis is placed on real-world application, requiring candidates to integrate foundational science with
professional standards, regulatory considerations, and evidence-based practice. The assessment prepares
students for advanced roles by ensuring competency in diagnostic interpretation, pathophysiological
analysis, and patient-centered management strategies.
SECTION ONE: QUESTIONS 1–100
1. A 58-year-old male with a 30-year history of smoking presents with chronic obstructive
pulmonary disease. A biopsy of bronchial tissue reveals columnar epithelial cells transforming into
stratified squamous epithelial cells. The pathophysiological process best describes which type of
cellular adaptation?
A. Hyperplasia due to chronic irritation from cigarette smoke
B. Metaplasia representing a reversible replacement of one cell type with another
C. Dysplasia indicating malignant transformation of the bronchial epithelium
D. Anaplasia showing undifferentiated cells with loss of normal architecture
🟢 B. Metaplasia representing a reversible replacement of one cell type with another
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type with another as an
adaptive response to chronic stress. In this case, columnar respiratory epithelium is replaced by
stratified squamous epithelium due to prolonged smoke exposure.
2. A 72-year-old female patient is admitted with dehydration after prolonged vomiting. Laboratory
results reveal a serum sodium level of 119 mEq/L. The patient complains of headache, nausea, and
confusion. What is the primary pathophysiological mechanism responsible for this patient's
neurological symptoms?
,A. Rapid movement of potassium ions into neurons causing hyperexcitability
B. Accumulation of intracellular calcium leading to neuronal apoptosis
C. Cerebral edema from water shifting into brain cells due to hyposmolality
D. Increased blood viscosity impairing cerebral perfusion and oxygen delivery
🟢 C. Cerebral edema from water shifting into brain cells due to hyposmolality
🔴 RATIONALE: When serum sodium drops rapidly, extracellular fluid becomes hypotonic relative to
intracellular fluid, causing water to move into brain cells by osmosis. This cerebral edema increases
intracranial pressure and produces neurological symptoms.
3. A 45-year-old male patient arrives at the emergency department with severe crushing chest pain.
Cardiac enzyme studies show elevated troponin levels, and an ECG reveals ST-segment elevation.
What type of cellular necrosis is most likely occurring in the affected myocardial tissue?
A. Liquefactive necrosis due to enzymatic digestion of cardiac muscle fibers
B. Caseous necrosis forming granulomas within the myocardial tissue
C. Coagulative necrosis preserving cellular outlines in the infarcted area
D. Fat necrosis from lipase activation destroying myocardial cell membranes
🟢 C. Coagulative necrosis preserving cellular outlines in the infarcted area
🔴 RATIONALE: Coagulative necrosis is the most common form of necrosis in ischemic injury to solid
organs such as the heart. Protein denaturation dominates over enzymatic digestion, preserving tissue
architecture.
4. A graduate nursing student asks the professor to explain the absolute refractory period of the
action potential. What response by the professor is most accurate?
A. A stimulus can evoke a response only if it is of sufficient intensity
B. No stimulus is able to evoke another response at this time
C. The membrane potential is hyperpolarized and requires a stronger stimulus
D. Potassium channels are open and sodium channels are partially inactivated
🟢 B. No stimulus is able to evoke another response at this time
🔴 RATIONALE: During the absolute refractory period, sodium channels are inactivated and cannot
reopen regardless of stimulus strength. This ensures one-way propagation of the action potential.
5. A patient's blood gases reveal the following findings: pH 7.3, bicarbonate 27 mEq/L, and carbon
dioxide 58 mmHg. What is the interpretation of these gases?
A. Respiratory alkalosis
B. Metabolic acidosis
C. Respiratory acidosis
D. Metabolic alkalosis
🟢 C. Respiratory acidosis
, 🔴 RATIONALE: The pH is below 7.35 indicating acidosis. Elevated CO2 (greater than 45 mmHg)
indicates a respiratory cause. The bicarbonate level is near normal, suggesting compensation has not
yet fully occurred.
6. Which type of cell adaptation occurs when normal columnar ciliated epithelial cells of the
bronchial lining have been replaced by stratified squamous epithelial cells?
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Atrophy
🟢 B. Metaplasia
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type with another. In the
bronchial lining, chronic irritation causes columnar epithelium to be replaced by stratified squamous
epithelium.
7. A patient has a serum sodium level of 165 mEq/L. The healthcare professional explains that the
clinical manifestations of confusion, convulsions, cerebral hemorrhage, and coma are caused by
what mechanism?
A. Low sodium in the blood vessels pulls water into brain cells, causing them to swell
B. High sodium in the blood vessels pulls water out of brain cells, causing them to shrink
C. Sodium rapidly enters brain cells causing hyperexcitability and seizure activity
D. Sodium binds to cerebral proteins disrupting neurotransmitter release and function
🟢 B. High sodium in the blood vessels pulls water out of brain cells, causing them to shrink
🔴 RATIONALE: Hypernatremia creates a hypertonic extracellular environment. Water moves out of
brain cells by osmosis, causing cellular shrinkage and neurological symptoms.
8. What syndrome characterized by an absent homologous X chromosome with only a single X
chromosome exhibits features that include short stature, widely spaced nipples, and webbed neck?
A. Turner syndrome
B. Klinefelter syndrome
C. Down syndrome
D. Prader-Willi syndrome
🟢 A. Turner syndrome
🔴 RATIONALE: Turner syndrome results from a missing X chromosome (45,X). Classic features include
short stature, webbed neck, widely spaced nipples, and gonadal dysgenesis.
9. What is the blood type of a person who is heterozygous, having A and B alleles as codominant?
A. Type A
B. Type B
AND EXAM PREP QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
Cellular Adaptation, Injury, and Death
Genetics and Genetic Disorders
Fluid, Electrolyte, and Acid-Base Balance
Cardiovascular and Hematologic Pathophysiology
Pulmonary and Renal Pathophysiology
Neurological and Endocrine Dysfunction
Immunologic Pathophysiology and Inflammation
Gastrointestinal System Disorders
Introduction
The NUR 631 Midterm Examination assesses advanced-practice nursing knowledge in physiology and
pathophysiology at the graduate level. It evaluates the ability to analyze cellular mechanisms, genetic
influences, and systemic alterations that underlie disease processes. The examination employs multiple-
choice and scenario-based questions designed to measure clinical reasoning and decision-making.
Emphasis is placed on real-world application, requiring candidates to integrate foundational science with
professional standards, regulatory considerations, and evidence-based practice. The assessment prepares
students for advanced roles by ensuring competency in diagnostic interpretation, pathophysiological
analysis, and patient-centered management strategies.
SECTION ONE: QUESTIONS 1–100
1. A 58-year-old male with a 30-year history of smoking presents with chronic obstructive
pulmonary disease. A biopsy of bronchial tissue reveals columnar epithelial cells transforming into
stratified squamous epithelial cells. The pathophysiological process best describes which type of
cellular adaptation?
A. Hyperplasia due to chronic irritation from cigarette smoke
B. Metaplasia representing a reversible replacement of one cell type with another
C. Dysplasia indicating malignant transformation of the bronchial epithelium
D. Anaplasia showing undifferentiated cells with loss of normal architecture
🟢 B. Metaplasia representing a reversible replacement of one cell type with another
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type with another as an
adaptive response to chronic stress. In this case, columnar respiratory epithelium is replaced by
stratified squamous epithelium due to prolonged smoke exposure.
2. A 72-year-old female patient is admitted with dehydration after prolonged vomiting. Laboratory
results reveal a serum sodium level of 119 mEq/L. The patient complains of headache, nausea, and
confusion. What is the primary pathophysiological mechanism responsible for this patient's
neurological symptoms?
,A. Rapid movement of potassium ions into neurons causing hyperexcitability
B. Accumulation of intracellular calcium leading to neuronal apoptosis
C. Cerebral edema from water shifting into brain cells due to hyposmolality
D. Increased blood viscosity impairing cerebral perfusion and oxygen delivery
🟢 C. Cerebral edema from water shifting into brain cells due to hyposmolality
🔴 RATIONALE: When serum sodium drops rapidly, extracellular fluid becomes hypotonic relative to
intracellular fluid, causing water to move into brain cells by osmosis. This cerebral edema increases
intracranial pressure and produces neurological symptoms.
3. A 45-year-old male patient arrives at the emergency department with severe crushing chest pain.
Cardiac enzyme studies show elevated troponin levels, and an ECG reveals ST-segment elevation.
What type of cellular necrosis is most likely occurring in the affected myocardial tissue?
A. Liquefactive necrosis due to enzymatic digestion of cardiac muscle fibers
B. Caseous necrosis forming granulomas within the myocardial tissue
C. Coagulative necrosis preserving cellular outlines in the infarcted area
D. Fat necrosis from lipase activation destroying myocardial cell membranes
🟢 C. Coagulative necrosis preserving cellular outlines in the infarcted area
🔴 RATIONALE: Coagulative necrosis is the most common form of necrosis in ischemic injury to solid
organs such as the heart. Protein denaturation dominates over enzymatic digestion, preserving tissue
architecture.
4. A graduate nursing student asks the professor to explain the absolute refractory period of the
action potential. What response by the professor is most accurate?
A. A stimulus can evoke a response only if it is of sufficient intensity
B. No stimulus is able to evoke another response at this time
C. The membrane potential is hyperpolarized and requires a stronger stimulus
D. Potassium channels are open and sodium channels are partially inactivated
🟢 B. No stimulus is able to evoke another response at this time
🔴 RATIONALE: During the absolute refractory period, sodium channels are inactivated and cannot
reopen regardless of stimulus strength. This ensures one-way propagation of the action potential.
5. A patient's blood gases reveal the following findings: pH 7.3, bicarbonate 27 mEq/L, and carbon
dioxide 58 mmHg. What is the interpretation of these gases?
A. Respiratory alkalosis
B. Metabolic acidosis
C. Respiratory acidosis
D. Metabolic alkalosis
🟢 C. Respiratory acidosis
, 🔴 RATIONALE: The pH is below 7.35 indicating acidosis. Elevated CO2 (greater than 45 mmHg)
indicates a respiratory cause. The bicarbonate level is near normal, suggesting compensation has not
yet fully occurred.
6. Which type of cell adaptation occurs when normal columnar ciliated epithelial cells of the
bronchial lining have been replaced by stratified squamous epithelial cells?
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Atrophy
🟢 B. Metaplasia
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type with another. In the
bronchial lining, chronic irritation causes columnar epithelium to be replaced by stratified squamous
epithelium.
7. A patient has a serum sodium level of 165 mEq/L. The healthcare professional explains that the
clinical manifestations of confusion, convulsions, cerebral hemorrhage, and coma are caused by
what mechanism?
A. Low sodium in the blood vessels pulls water into brain cells, causing them to swell
B. High sodium in the blood vessels pulls water out of brain cells, causing them to shrink
C. Sodium rapidly enters brain cells causing hyperexcitability and seizure activity
D. Sodium binds to cerebral proteins disrupting neurotransmitter release and function
🟢 B. High sodium in the blood vessels pulls water out of brain cells, causing them to shrink
🔴 RATIONALE: Hypernatremia creates a hypertonic extracellular environment. Water moves out of
brain cells by osmosis, causing cellular shrinkage and neurological symptoms.
8. What syndrome characterized by an absent homologous X chromosome with only a single X
chromosome exhibits features that include short stature, widely spaced nipples, and webbed neck?
A. Turner syndrome
B. Klinefelter syndrome
C. Down syndrome
D. Prader-Willi syndrome
🟢 A. Turner syndrome
🔴 RATIONALE: Turner syndrome results from a missing X chromosome (45,X). Classic features include
short stature, webbed neck, widely spaced nipples, and gonadal dysgenesis.
9. What is the blood type of a person who is heterozygous, having A and B alleles as codominant?
A. Type A
B. Type B
