NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Midterm Exam: NUR631 / NUR 631
Advanced Physiology and Pathophysiology | Questions and Verified Answers | 100%
Latest 2026/2027 Update - Graduate Nursing Midterm Examination
Course: NUR 631 - Advanced Physiology and Pathophysiology | Graduate Nursing
Assessment: Midterm Examination - Questions and Verified Answers | 100%
Format: 140 Multiple-Choice Questions (4 options, one correct)
Cognitive Distribution: 30% Recall | 50% Application | 20% Analysis
Question Style: 70% Scenario-Based | 30% Direct Recall of Mechanisms
Coverage: Cellular through Neurologic/Musculoskeletal Pathophysiology
This NUR 631 Midterm Examination evaluates graduate-level mastery of advanced physiology and pathophysiology across ten
integrated domains: cellular physiology; genetics and epigenetics; fluid, electrolyte, and acid-base; immune and inflammatory;
hematologic; cardiovascular; respiratory; renal; endocrine; and neurologic/musculoskeletal. Each question is
mechanism-focused, requiring explanation of pathophysiologic processes rather than symptom recall, and is followed by the
verified correct answer with a detailed rationale linking pathophysiology to clinical findings and laboratory correlations.
Distractors are designed around common graduate pathophysiology pitfalls: confusing necrosis with apoptosis, misidentifying
hypersensitivity types, misunderstanding compensation direction in acid-base disorders, confusing DKA with HHS
pathophysiology, misattributing hormone feedback mechanisms, confusing preload vs. afterload physiology, misidentifying
AKI types, and misunderstanding V/Q mismatch patterns.
Section 1: Cellular Physiology and Pathophysiology
Cell structure, membrane transport, homeostasis, cellular adaptation
(atrophy/hypertrophy/hyperplasia/metaplasia/dysplasia), injury mechanisms (hypoxia, free radicals, reperfusion), and
death (necrosis subtypes, apoptosis)
Q1: Which pathophysiologic mechanism BEST explains cellular swelling during hypoxic injury?
A. Inhibition of Na+/K+-ATPase leads to intracellular Na+ accumulation; water follows osmotically, causing
hydropic swelling. [CORRECT]
B. Activation of Na+/K+-ATPase increases intracellular K+, drawing water into the cell.
C. Calcium influx activates proteases that increase membrane permeability to water.
D. Increased anaerobic glycolysis raises intracellular osmotic load from lactate.
Correct Answer: A
Rationale: Hypoxia depletes ATP, causing failure of the Na+/K+-ATPase. Sodium accumulates intracellularly, water
follows osmotically, and the cell swells (hydropic change). Other options either misattribute direction of pump action or
describe secondary effects, not the primary mechanism of swelling.
Page 1 Z.ai
,NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q2: A researcher observes a cell moving glucose against its concentration gradient using a carrier protein that
also moves Na+ down its gradient. This is an example of:
A. Facilitated diffusion.
B. Secondary active transport (symport) using the Na+ gradient established by Na+/K+-ATPase.
[CORRECT]
C. Primary active transport via a P-type ATPase.
D. Simple diffusion through aquaporins.
Correct Answer: B
Rationale: Secondary active transport harnesses the Na+ gradient (created by primary active transport via Na+/K+-ATPase)
to co-transport solutes such as glucose against their gradient (SGLT). Facilitated diffusion is passive; primary active transport
directly hydrolyzes ATP for the transported solute; aquaporins conduct water, not glucose.
Q3: A cell placed in a 0.45% NaCl solution will:
A. Shrink as water exits the cell.
B. Swell and lyse as the hypotonic extracellular fluid drives water into the cell. [CORRECT]
C. Remain unchanged because NaCl does not cross the membrane.
D. Activate active transport of NaCl outward.
Correct Answer: B
Rationale: A 0.45% NaCl solution (~154 mOsm/L total solute; actually ~154 mOsm/L is 0.9% saline) is hypotonic to the
intracellular fluid (~290 mOsm/L). Water moves from low to high solute concentration, entering the cell and causing swelling
and potential lysis. 0.9% NaCl (normal saline) is isotonic; 0.45% is half-strength and hypotonic.
Q4: Which cellular adaptation BEST describes the response of skeletal muscle to prolonged resistance training?
A. Hyperplasia - increase in cell number.
B. Hypertrophy - increase in cell size without cell division. [CORRECT]
C. Metaplasia - change from one mature cell type to another.
D. Atrophy - decrease in cell size.
Correct Answer: B
Rationale: Skeletal muscle adapts to increased workload by hypertrophy (increase in cell size via protein synthesis) since
mature skeletal muscle cells cannot divide. Hyperplasia is an increase in cell number (e.g., hormonal stimulation of
endometrium). Metaplasia is reversible cell type substitution (e.g., Barrett esophagus). Atrophy is shrinkage from disuse.
Q5: A biopsy of the bronchial epithelium in a chronic smoker shows replacement of normal ciliated
pseudostratified columnar epithelium with stratified squamous epithelium. This adaptation is:
A. Atrophy.
B. Hypertrophy.
C. Metaplasia - reversible substitution of one adult cell type for another in response to chronic irritation.
[CORRECT]
D. Dysplasia.
Correct Answer: C
Rationale: Metaplasia is the reversible substitution of one differentiated adult cell type for another, often as a protective
response (e.g., squamous metaplasia in chronic irritation from smoke). It can become persistent and predispose to malignant
transformation. Atrophy is size reduction; hypertrophy is size increase; dysplasia is disordered growth within the same cell
type.
Page 2 Z.ai
,NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q6: Which histologic feature MOST reliably distinguishes apoptosis from necrosis?
A. Marked inflammatory infiltrate.
B. Random DNA fragmentation and cell rupture.
C. Preserved membrane integrity with chromatin condensation and formation of apoptotic bodies, minimal
inflammation. [CORRECT]
D. Mitochondrial swelling and rupture of plasma membrane.
Correct Answer: C
Rationale: Apoptosis is programmed cell death characterized by chromatin condensation, cell shrinkage, membrane
blebbing, and apoptotic bodies with preserved membrane integrity, minimal inflammation, and caspase activation. Necrosis
features membrane rupture, cellular swelling, inflammatory infiltrate, and random DNA degradation.
Q7: A pathologist examines tissue from a recent myocardial infarction and observes coagulative necrosis.
Which mechanism BEST explains this pattern?
A. Liquefaction by neutrophil enzymes.
B. Protein denaturation preserving tissue architecture, characteristic of ischemic injury in solid organs
(except brain). [CORRECT]
C. Caseous necrosis from mycobacterial infection.
D. Fat necrosis from pancreatic enzymes.
Correct Answer: B
Rationale: Coagulative necrosis results from protein denaturation that preserves tissue architecture; it is characteristic of
ischemic injury in solid organs such as heart, kidney, and spleen. Liquefactive necrosis (brain infarcts, abscess) reflects
enzymatic digestion. Caseous (cheesy, TB) and fat necrosis (pancreatic) are distinct patterns.
Q8: Which mechanism BEST accounts for reperfusion injury after restoration of blood flow to ischemic tissue?
A. Restoration of ATP synthesis immediately reverses all injury.
B. Sudden oxygen influx fuels reactive oxygen species (ROS) generation, calcium overload, and neutrophil
activation that exacerbate injury. [CORRECT]
C. Reperfusion blocks the electron transport chain permanently.
D. Reperfusion removes intracellular Na+ too quickly, causing osmotic stress.
Correct Answer: B
Rationale: Reperfusion injury is mediated by ROS generation (via xanthine oxidase, mitochondrial leak), intracellular Ca2+
overload activating proteases and phospholipases, complement activation, and neutrophil influx with microvascular
obstruction. The injury occurs despite, or because of, restored blood flow.
Q9: Which cell organelle is the primary site of aerobic ATP production, and its dysfunction most directly
contributes to which process in cellular injury?
A. Rough ER; protein misfolding.
B. Mitochondria; decreased oxidative phosphorylation and ATP depletion, with cytochrome c release
triggering apoptosis. [CORRECT]
C. Lysosome; impaired autophagy.
D. Golgi apparatus; defective post-translational modification.
Correct Answer: B
Rationale: Mitochondria synthesize ATP via oxidative phosphorylation; dysfunction causes ATP depletion and failure of
Na+/K+-ATPase (cellular swelling), and releases cytochrome c, triggering caspase-9 activation and apoptosis. Other
organelles contribute to injury but are not the primary energy source.
Page 3 Z.ai
, NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q10: Which pathophysiologic mechanism BEST explains why cells of the renal proximal tubule are particularly
vulnerable to ischemic injury?
A. They have low metabolic demand and abundant glycogen stores.
B. They perform energy-intensive transport (Na+/K+-ATPase for reabsorption) yet receive blood in a
countercurrent system that lowers medullary oxygen tension, making them borderline hypoxic even at
baseline. [CORRECT]
C. They are entirely dependent on anaerobic glycolysis.
D. They lack mitochondria.
Correct Answer: B
Rationale: Proximal tubule cells reabsorb the bulk of filtered Na+ (high ATP demand) but the medullary thick ascending
limb and proximal tubule sit in a hypoxic medullary environment due to countercurrent exchange. Small reductions in oxygen
delivery precipitate ischemic injury (e.g., ATN). The other options are factually incorrect.
Q11: A cell exposed to a high concentration of superoxide anion (O2-) sustains membrane injury primarily via
which mechanism?
A. Direct DNA methylation.
B. Lipid peroxidation of membrane phospholipids, protein oxidation, and DNA strand breaks leading to cell
death. [CORRECT]
C. Activation of lysosomal hydrolases.
D. Inhibition of mitochondrial biogenesis only.
Correct Answer: B
Rationale: ROS (superoxide, hydrogen peroxide, hydroxyl radical) cause lipid peroxidation (membrane damage), protein
oxidation (enzyme dysfunction), and DNA damage. The hydroxyl radical is most reactive. Antioxidants (SOD, catalase,
glutathione peroxidase) defend against ROS. The other options are secondary or incorrect.
Q12: Which statement MOST accurately describes cellular atrophy?
A. An increase in cell size due to increased workload.
B. A decrease in cell size due to decreased physiologic stress or pathologic insult (e.g., denervation, disuse,
ischemia). [CORRECT]
C. A change in cell type due to chronic irritation.
D. Disordered cellular maturation.
Correct Answer: B
Rationale: Atrophy is shrinkage in cell size due to decreased workload (disuse), denervation, ischemia, inadequate nutrition,
or aging. It reflects decreased protein synthesis and increased proteasomal/lysosomal degradation. It may be reversible if the
stimulus is removed. Hypertrophy is increased size; metaplasia is cell type change; dysplasia is disordered growth.
Q13: Which description BEST characterizes dysplasia?
A. A reversible adaptive change from one cell type to another.
B. Disordered growth (variation in size, shape, and orientation) within the same cell type, often premalignant.
[CORRECT]
C. An increase in cell number due to hormonal stimulation.
D. A decrease in organ size due to disuse.
Correct Answer: B
Rationale: Dysplasia is disordered cellular proliferation within the same cell type, characterized by pleomorphism,
hyperchromatic nuclei, abnormal mitoses, and loss of polarity. It is often premalignant and may progress to carcinoma in situ.
Metaplasia is a different cell type; hyperplasia is increased cell number; atrophy is size reduction.
Page 4 Z.ai
Midterm Exam: NUR631 / NUR 631
Advanced Physiology and Pathophysiology | Questions and Verified Answers | 100%
Latest 2026/2027 Update - Graduate Nursing Midterm Examination
Course: NUR 631 - Advanced Physiology and Pathophysiology | Graduate Nursing
Assessment: Midterm Examination - Questions and Verified Answers | 100%
Format: 140 Multiple-Choice Questions (4 options, one correct)
Cognitive Distribution: 30% Recall | 50% Application | 20% Analysis
Question Style: 70% Scenario-Based | 30% Direct Recall of Mechanisms
Coverage: Cellular through Neurologic/Musculoskeletal Pathophysiology
This NUR 631 Midterm Examination evaluates graduate-level mastery of advanced physiology and pathophysiology across ten
integrated domains: cellular physiology; genetics and epigenetics; fluid, electrolyte, and acid-base; immune and inflammatory;
hematologic; cardiovascular; respiratory; renal; endocrine; and neurologic/musculoskeletal. Each question is
mechanism-focused, requiring explanation of pathophysiologic processes rather than symptom recall, and is followed by the
verified correct answer with a detailed rationale linking pathophysiology to clinical findings and laboratory correlations.
Distractors are designed around common graduate pathophysiology pitfalls: confusing necrosis with apoptosis, misidentifying
hypersensitivity types, misunderstanding compensation direction in acid-base disorders, confusing DKA with HHS
pathophysiology, misattributing hormone feedback mechanisms, confusing preload vs. afterload physiology, misidentifying
AKI types, and misunderstanding V/Q mismatch patterns.
Section 1: Cellular Physiology and Pathophysiology
Cell structure, membrane transport, homeostasis, cellular adaptation
(atrophy/hypertrophy/hyperplasia/metaplasia/dysplasia), injury mechanisms (hypoxia, free radicals, reperfusion), and
death (necrosis subtypes, apoptosis)
Q1: Which pathophysiologic mechanism BEST explains cellular swelling during hypoxic injury?
A. Inhibition of Na+/K+-ATPase leads to intracellular Na+ accumulation; water follows osmotically, causing
hydropic swelling. [CORRECT]
B. Activation of Na+/K+-ATPase increases intracellular K+, drawing water into the cell.
C. Calcium influx activates proteases that increase membrane permeability to water.
D. Increased anaerobic glycolysis raises intracellular osmotic load from lactate.
Correct Answer: A
Rationale: Hypoxia depletes ATP, causing failure of the Na+/K+-ATPase. Sodium accumulates intracellularly, water
follows osmotically, and the cell swells (hydropic change). Other options either misattribute direction of pump action or
describe secondary effects, not the primary mechanism of swelling.
Page 1 Z.ai
,NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q2: A researcher observes a cell moving glucose against its concentration gradient using a carrier protein that
also moves Na+ down its gradient. This is an example of:
A. Facilitated diffusion.
B. Secondary active transport (symport) using the Na+ gradient established by Na+/K+-ATPase.
[CORRECT]
C. Primary active transport via a P-type ATPase.
D. Simple diffusion through aquaporins.
Correct Answer: B
Rationale: Secondary active transport harnesses the Na+ gradient (created by primary active transport via Na+/K+-ATPase)
to co-transport solutes such as glucose against their gradient (SGLT). Facilitated diffusion is passive; primary active transport
directly hydrolyzes ATP for the transported solute; aquaporins conduct water, not glucose.
Q3: A cell placed in a 0.45% NaCl solution will:
A. Shrink as water exits the cell.
B. Swell and lyse as the hypotonic extracellular fluid drives water into the cell. [CORRECT]
C. Remain unchanged because NaCl does not cross the membrane.
D. Activate active transport of NaCl outward.
Correct Answer: B
Rationale: A 0.45% NaCl solution (~154 mOsm/L total solute; actually ~154 mOsm/L is 0.9% saline) is hypotonic to the
intracellular fluid (~290 mOsm/L). Water moves from low to high solute concentration, entering the cell and causing swelling
and potential lysis. 0.9% NaCl (normal saline) is isotonic; 0.45% is half-strength and hypotonic.
Q4: Which cellular adaptation BEST describes the response of skeletal muscle to prolonged resistance training?
A. Hyperplasia - increase in cell number.
B. Hypertrophy - increase in cell size without cell division. [CORRECT]
C. Metaplasia - change from one mature cell type to another.
D. Atrophy - decrease in cell size.
Correct Answer: B
Rationale: Skeletal muscle adapts to increased workload by hypertrophy (increase in cell size via protein synthesis) since
mature skeletal muscle cells cannot divide. Hyperplasia is an increase in cell number (e.g., hormonal stimulation of
endometrium). Metaplasia is reversible cell type substitution (e.g., Barrett esophagus). Atrophy is shrinkage from disuse.
Q5: A biopsy of the bronchial epithelium in a chronic smoker shows replacement of normal ciliated
pseudostratified columnar epithelium with stratified squamous epithelium. This adaptation is:
A. Atrophy.
B. Hypertrophy.
C. Metaplasia - reversible substitution of one adult cell type for another in response to chronic irritation.
[CORRECT]
D. Dysplasia.
Correct Answer: C
Rationale: Metaplasia is the reversible substitution of one differentiated adult cell type for another, often as a protective
response (e.g., squamous metaplasia in chronic irritation from smoke). It can become persistent and predispose to malignant
transformation. Atrophy is size reduction; hypertrophy is size increase; dysplasia is disordered growth within the same cell
type.
Page 2 Z.ai
,NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q6: Which histologic feature MOST reliably distinguishes apoptosis from necrosis?
A. Marked inflammatory infiltrate.
B. Random DNA fragmentation and cell rupture.
C. Preserved membrane integrity with chromatin condensation and formation of apoptotic bodies, minimal
inflammation. [CORRECT]
D. Mitochondrial swelling and rupture of plasma membrane.
Correct Answer: C
Rationale: Apoptosis is programmed cell death characterized by chromatin condensation, cell shrinkage, membrane
blebbing, and apoptotic bodies with preserved membrane integrity, minimal inflammation, and caspase activation. Necrosis
features membrane rupture, cellular swelling, inflammatory infiltrate, and random DNA degradation.
Q7: A pathologist examines tissue from a recent myocardial infarction and observes coagulative necrosis.
Which mechanism BEST explains this pattern?
A. Liquefaction by neutrophil enzymes.
B. Protein denaturation preserving tissue architecture, characteristic of ischemic injury in solid organs
(except brain). [CORRECT]
C. Caseous necrosis from mycobacterial infection.
D. Fat necrosis from pancreatic enzymes.
Correct Answer: B
Rationale: Coagulative necrosis results from protein denaturation that preserves tissue architecture; it is characteristic of
ischemic injury in solid organs such as heart, kidney, and spleen. Liquefactive necrosis (brain infarcts, abscess) reflects
enzymatic digestion. Caseous (cheesy, TB) and fat necrosis (pancreatic) are distinct patterns.
Q8: Which mechanism BEST accounts for reperfusion injury after restoration of blood flow to ischemic tissue?
A. Restoration of ATP synthesis immediately reverses all injury.
B. Sudden oxygen influx fuels reactive oxygen species (ROS) generation, calcium overload, and neutrophil
activation that exacerbate injury. [CORRECT]
C. Reperfusion blocks the electron transport chain permanently.
D. Reperfusion removes intracellular Na+ too quickly, causing osmotic stress.
Correct Answer: B
Rationale: Reperfusion injury is mediated by ROS generation (via xanthine oxidase, mitochondrial leak), intracellular Ca2+
overload activating proteases and phospholipases, complement activation, and neutrophil influx with microvascular
obstruction. The injury occurs despite, or because of, restored blood flow.
Q9: Which cell organelle is the primary site of aerobic ATP production, and its dysfunction most directly
contributes to which process in cellular injury?
A. Rough ER; protein misfolding.
B. Mitochondria; decreased oxidative phosphorylation and ATP depletion, with cytochrome c release
triggering apoptosis. [CORRECT]
C. Lysosome; impaired autophagy.
D. Golgi apparatus; defective post-translational modification.
Correct Answer: B
Rationale: Mitochondria synthesize ATP via oxidative phosphorylation; dysfunction causes ATP depletion and failure of
Na+/K+-ATPase (cellular swelling), and releases cytochrome c, triggering caspase-9 activation and apoptosis. Other
organelles contribute to injury but are not the primary energy source.
Page 3 Z.ai
, NUR 631 Midterm: Advanced Physiology and Pathophysiology 140 Questions | 100% Verified
Q10: Which pathophysiologic mechanism BEST explains why cells of the renal proximal tubule are particularly
vulnerable to ischemic injury?
A. They have low metabolic demand and abundant glycogen stores.
B. They perform energy-intensive transport (Na+/K+-ATPase for reabsorption) yet receive blood in a
countercurrent system that lowers medullary oxygen tension, making them borderline hypoxic even at
baseline. [CORRECT]
C. They are entirely dependent on anaerobic glycolysis.
D. They lack mitochondria.
Correct Answer: B
Rationale: Proximal tubule cells reabsorb the bulk of filtered Na+ (high ATP demand) but the medullary thick ascending
limb and proximal tubule sit in a hypoxic medullary environment due to countercurrent exchange. Small reductions in oxygen
delivery precipitate ischemic injury (e.g., ATN). The other options are factually incorrect.
Q11: A cell exposed to a high concentration of superoxide anion (O2-) sustains membrane injury primarily via
which mechanism?
A. Direct DNA methylation.
B. Lipid peroxidation of membrane phospholipids, protein oxidation, and DNA strand breaks leading to cell
death. [CORRECT]
C. Activation of lysosomal hydrolases.
D. Inhibition of mitochondrial biogenesis only.
Correct Answer: B
Rationale: ROS (superoxide, hydrogen peroxide, hydroxyl radical) cause lipid peroxidation (membrane damage), protein
oxidation (enzyme dysfunction), and DNA damage. The hydroxyl radical is most reactive. Antioxidants (SOD, catalase,
glutathione peroxidase) defend against ROS. The other options are secondary or incorrect.
Q12: Which statement MOST accurately describes cellular atrophy?
A. An increase in cell size due to increased workload.
B. A decrease in cell size due to decreased physiologic stress or pathologic insult (e.g., denervation, disuse,
ischemia). [CORRECT]
C. A change in cell type due to chronic irritation.
D. Disordered cellular maturation.
Correct Answer: B
Rationale: Atrophy is shrinkage in cell size due to decreased workload (disuse), denervation, ischemia, inadequate nutrition,
or aging. It reflects decreased protein synthesis and increased proteasomal/lysosomal degradation. It may be reversible if the
stimulus is removed. Hypertrophy is increased size; metaplasia is cell type change; dysplasia is disordered growth.
Q13: Which description BEST characterizes dysplasia?
A. A reversible adaptive change from one cell type to another.
B. Disordered growth (variation in size, shape, and orientation) within the same cell type, often premalignant.
[CORRECT]
C. An increase in cell number due to hormonal stimulation.
D. A decrease in organ size due to disuse.
Correct Answer: B
Rationale: Dysplasia is disordered cellular proliferation within the same cell type, characterized by pleomorphism,
hyperchromatic nuclei, abnormal mitoses, and loss of polarity. It is often premalignant and may progress to carcinoma in situ.
Metaplasia is a different cell type; hyperplasia is increased cell number; atrophy is size reduction.
Page 4 Z.ai
