, Nurs 611 Exam 4 Advanced Pathophysiology (Maryville
University) Newest 2026 Complete Questions And Correct
Answers (Verified Answers) |Already Graded A+ - 150
Questions
Section 1: Cellular Adaptation and Injury (Questions 1-15)
1 A researcher is studying the effects of chronic ischemia on cardiac myocytes. Which molecular adaptation is
most likely to precede irreversible cell injury in this context?
A) Upregulation of hypoxia-inducible factor 1 (HIF-1) and increased glycolysis
B) Increased expression of cytochrome c oxidase and enhanced oxidative phosphorylation
C) Activation of caspase-8 and formation of death-inducing signaling complex (DISC)
D) Downregulation of Bcl-2 and release of cytochrome c from mitochondria
Answer: A
Rationale: In chronic ischemia, cells adapt by upregulating HIF-1±, which promotes glycolysis and angiogenesis to
survive hypoxia. Options B and D are associated with irreversible injury or apoptosis, not adaptation. Option C is
part of the extrinsic apoptosis pathway, not an adaptive response.
2 Which of the following best explains why cardiac hypertrophy in hypertension can transition from
compensatory to decompensated (failure) at the molecular level?
A) Sustained activation of the phosphatidylinositol 3-kinase (PI3K)/Akt pathway leading to increased protein
synthesis
B) Shift from adult -myosin heavy chain (-MHC) to fetal -MHC isoform and decreased ATPase activity
C) Increased capillary density relative to myocyte size, improving oxygen delivery
D) Enhanced calcium handling due to upregulation of SERCA2a
Answer: B
Rationale: Decompensated hypertrophy involves a reversion to fetal gene program, including ²-MHC, which has
lower ATPase activity and reduces contractile efficiency. Option A is adaptive in compensated hypertrophy.
Options C and D are compensatory improvements, not maladaptive.
3 In a liver biopsy from a patient with chronic alcohol use, hepatocytes show enlarged nuclei and clumped
chromatin. Which cellular adaptation is most likely present?
A) Metaplasia with dysplasia
B) Nuclear hypertrophy with polyploidy
C) Apoptosis with nuclear fragmentation
D) Necrosis with karyolysis
Answer: B
Rationale: Chronic alcohol exposure induces hepatocyte polyploidy (enlarged nuclei, increased DNA content) as an
adaptive response to metabolic stress. Metaplasia involves change in cell type, not nuclear changes. Apoptosis and
necrosis are forms of cell death, not adaptation.
4 A cell exposed to a sublethal dose of a chemical toxin shows swelling of the endoplasmic reticulum and
dissociation of ribosomes. Which stage of cell injury is this?
A) Reversible injury with impaired protein synthesis
,B) Irreversible injury with membrane damage
C) Adaptive response with increased protein folding
D) Necrosis with nuclear pyknosis
Answer: A
Rationale: ER swelling and ribosome detachment indicate reversible injury affecting protein synthesis. Irreversible
injury is marked by membrane damage and mitochondrial dysfunction. Adaptive responses involve upregulation of
chaperones, not structural disruption. Nuclear pyknosis is a feature of necrosis, not reversible injury.
5 Which of the following cellular changes is most characteristic of irreversible injury due to hypoxia?
A) Formation of blebs on the plasma membrane
B) Reduced ATP levels to 50% of normal
C) Loss of microvilli and dilation of the ER
D) Appearance of amorphous densities in mitochondria
Answer: D
Rationale: Amorphous densities in mitochondria are a hallmark of irreversible injury, indicating severe
mitochondrial damage. Blebs, reduced ATP, and ER dilation can occur in reversible injury. Irreversibility is
signaled by mitochondrial dysfunction with these densities.
6 A pathologist observes a tissue section with cells that have undergone a change from one differentiated cell type
to another. Which cellular adaptation is present?
A) Hyperplasia
B) Metaplasia
C) Dysplasia
D) Anaplasia
Answer: B
Rationale: Metaplasia is the reversible replacement of one mature cell type by another, often in response to chronic
irritation. Hyperplasia is an increase in cell number, dysplasia is abnormal growth, and anaplasia is loss of
differentiation in cancer.
7 In the context of cell injury, which of the following is a direct consequence of increased cytosolic calcium?
A) Activation of phospholipases and proteases
B) Inhibition of the mitochondrial permeability transition pore
C) Enhanced ATP synthesis via oxidative phosphorylation
D) Stabilization of lysosomal membranes
Answer: A
Rationale: Increased cytosolic Ca2+ activates phospholipases, proteases, and endonucleases, leading to membrane
damage and cell injury. It promotes mitochondrial permeability transition, not inhibition. ATP synthesis is
impaired, and lysosomal membranes are destabilized, not stabilized.
8 Which of the following best describes the role of reactive oxygen species (ROS) in cell injury?
A) ROS directly activate caspases to induce apoptosis
B) ROS cause lipid peroxidation, protein oxidation, and DNA damage
C) ROS are primarily generated by peroxisomes during fatty acid oxidation
D) ROS are neutralized by superoxide dismutase, which converts them to water
Answer: B
Rationale: ROS cause injury by peroxidizing membrane lipids, oxidizing proteins, and damaging DNA. They can
indirectly trigger apoptosis but do not directly activate caspases. ROS are mainly from mitochondria, not
, peroxisomes. Superoxide dismutase converts superoxide to H2O2, not water.
9 In a tissue sample, cells show increased cell size and organelle number, but no change in cell number. This
adaptation is most likely due to:
A) Increased functional demand and growth factor stimulation
B) Chronic inflammation and cytokine release
C) Loss of trophic signals from neighboring cells
D) Mutation in the p53 tumor suppressor gene
Answer: A
Rationale: Hypertrophy is an increase in cell size due to increased workload and growth factors. Hyperplasia
involves increased cell number. Chronic inflammation can cause both, but the description fits hypertrophy. Loss of
trophic signals leads to atrophy. p53 mutation is associated with neoplasia.
10 Which of the following is a key difference between necrosis and apoptosis?
A) Necrosis is ATP-dependent, while apoptosis is ATP-independent
B) Apoptosis involves cell swelling, while necrosis involves cell shrinkage
C) Necrosis typically elicits an inflammatory response, while apoptosis does not
D) Apoptosis is always pathological, while necrosis is always physiological
Answer: C
Rationale: Necrosis releases cellular contents, triggering inflammation; apoptosis involves orderly dismantling
without inflammation. Apoptosis is ATP-dependent; necrosis is not. Apoptosis features cell shrinkage, necrosis
features swelling. Both can be physiological or pathological depending on context.
11 A researcher is studying the effects of a novel chemotherapeutic agent that inhibits topoisomerase II. In a cell
culture model, exposure to the drug leads to increased expression of p53 and activation of the intrinsic
apoptotic pathway. However, in a subset of cells with a mutation in the gene encoding Bax, the drug fails to
induce apoptosis, and these cells instead exhibit a marked increase in cell size with an expanded endoplasmic
reticulum and accumulation of polyubiquitinated proteins. Which of the following best describes the cellular
adaptation occurring in the Bax-mutant cells?
A) Apoptosis resistance due to defective mitochondrial outer membrane permeabilization
B) Hypertrophy secondary to endoplasmic reticulum stress and impaired autophagy
C) Hyperplasia driven by compensatory proliferation signals
D) Dysplasia characterized by loss of cellular uniformity and architectural disorganization
Answer: B
Rationale: The cells exhibit increased size, expanded ER, and accumulation of polyubiquitinated proteins, which are
hallmarks of cellular hypertrophy due to ER stress and impaired proteasomal/autophagic clearance. Option A
describes a molecular mechanism but not the adaptive cellular response. Hyperplasia (C) involves increased cell
number, not size. Dysplasia (D) is a deranged growth pattern, not simply increased cell size.
12 In a study of chronic ischemia in cardiac myocytes, researchers observe that cells initially undergo a reversible
adaptation characterized by increased expression of hypoxia-inducible factor 1 (HIF-1) and upregulation of
glycolytic enzymes. However, with persistent ischemia, some myocytes develop intracellular lipid droplets and
accumulate lipofuscin granules. Which of the following best describes the sequence of cellular adaptations in
this scenario?
A) Atrophy followed by intracellular accumulation
B) Metabolic adaptation (cellular adaptation) followed by pathologic intracellular accumulation
C) Hyperplasia followed by dysplasia
University) Newest 2026 Complete Questions And Correct
Answers (Verified Answers) |Already Graded A+ - 150
Questions
Section 1: Cellular Adaptation and Injury (Questions 1-15)
1 A researcher is studying the effects of chronic ischemia on cardiac myocytes. Which molecular adaptation is
most likely to precede irreversible cell injury in this context?
A) Upregulation of hypoxia-inducible factor 1 (HIF-1) and increased glycolysis
B) Increased expression of cytochrome c oxidase and enhanced oxidative phosphorylation
C) Activation of caspase-8 and formation of death-inducing signaling complex (DISC)
D) Downregulation of Bcl-2 and release of cytochrome c from mitochondria
Answer: A
Rationale: In chronic ischemia, cells adapt by upregulating HIF-1±, which promotes glycolysis and angiogenesis to
survive hypoxia. Options B and D are associated with irreversible injury or apoptosis, not adaptation. Option C is
part of the extrinsic apoptosis pathway, not an adaptive response.
2 Which of the following best explains why cardiac hypertrophy in hypertension can transition from
compensatory to decompensated (failure) at the molecular level?
A) Sustained activation of the phosphatidylinositol 3-kinase (PI3K)/Akt pathway leading to increased protein
synthesis
B) Shift from adult -myosin heavy chain (-MHC) to fetal -MHC isoform and decreased ATPase activity
C) Increased capillary density relative to myocyte size, improving oxygen delivery
D) Enhanced calcium handling due to upregulation of SERCA2a
Answer: B
Rationale: Decompensated hypertrophy involves a reversion to fetal gene program, including ²-MHC, which has
lower ATPase activity and reduces contractile efficiency. Option A is adaptive in compensated hypertrophy.
Options C and D are compensatory improvements, not maladaptive.
3 In a liver biopsy from a patient with chronic alcohol use, hepatocytes show enlarged nuclei and clumped
chromatin. Which cellular adaptation is most likely present?
A) Metaplasia with dysplasia
B) Nuclear hypertrophy with polyploidy
C) Apoptosis with nuclear fragmentation
D) Necrosis with karyolysis
Answer: B
Rationale: Chronic alcohol exposure induces hepatocyte polyploidy (enlarged nuclei, increased DNA content) as an
adaptive response to metabolic stress. Metaplasia involves change in cell type, not nuclear changes. Apoptosis and
necrosis are forms of cell death, not adaptation.
4 A cell exposed to a sublethal dose of a chemical toxin shows swelling of the endoplasmic reticulum and
dissociation of ribosomes. Which stage of cell injury is this?
A) Reversible injury with impaired protein synthesis
,B) Irreversible injury with membrane damage
C) Adaptive response with increased protein folding
D) Necrosis with nuclear pyknosis
Answer: A
Rationale: ER swelling and ribosome detachment indicate reversible injury affecting protein synthesis. Irreversible
injury is marked by membrane damage and mitochondrial dysfunction. Adaptive responses involve upregulation of
chaperones, not structural disruption. Nuclear pyknosis is a feature of necrosis, not reversible injury.
5 Which of the following cellular changes is most characteristic of irreversible injury due to hypoxia?
A) Formation of blebs on the plasma membrane
B) Reduced ATP levels to 50% of normal
C) Loss of microvilli and dilation of the ER
D) Appearance of amorphous densities in mitochondria
Answer: D
Rationale: Amorphous densities in mitochondria are a hallmark of irreversible injury, indicating severe
mitochondrial damage. Blebs, reduced ATP, and ER dilation can occur in reversible injury. Irreversibility is
signaled by mitochondrial dysfunction with these densities.
6 A pathologist observes a tissue section with cells that have undergone a change from one differentiated cell type
to another. Which cellular adaptation is present?
A) Hyperplasia
B) Metaplasia
C) Dysplasia
D) Anaplasia
Answer: B
Rationale: Metaplasia is the reversible replacement of one mature cell type by another, often in response to chronic
irritation. Hyperplasia is an increase in cell number, dysplasia is abnormal growth, and anaplasia is loss of
differentiation in cancer.
7 In the context of cell injury, which of the following is a direct consequence of increased cytosolic calcium?
A) Activation of phospholipases and proteases
B) Inhibition of the mitochondrial permeability transition pore
C) Enhanced ATP synthesis via oxidative phosphorylation
D) Stabilization of lysosomal membranes
Answer: A
Rationale: Increased cytosolic Ca2+ activates phospholipases, proteases, and endonucleases, leading to membrane
damage and cell injury. It promotes mitochondrial permeability transition, not inhibition. ATP synthesis is
impaired, and lysosomal membranes are destabilized, not stabilized.
8 Which of the following best describes the role of reactive oxygen species (ROS) in cell injury?
A) ROS directly activate caspases to induce apoptosis
B) ROS cause lipid peroxidation, protein oxidation, and DNA damage
C) ROS are primarily generated by peroxisomes during fatty acid oxidation
D) ROS are neutralized by superoxide dismutase, which converts them to water
Answer: B
Rationale: ROS cause injury by peroxidizing membrane lipids, oxidizing proteins, and damaging DNA. They can
indirectly trigger apoptosis but do not directly activate caspases. ROS are mainly from mitochondria, not
, peroxisomes. Superoxide dismutase converts superoxide to H2O2, not water.
9 In a tissue sample, cells show increased cell size and organelle number, but no change in cell number. This
adaptation is most likely due to:
A) Increased functional demand and growth factor stimulation
B) Chronic inflammation and cytokine release
C) Loss of trophic signals from neighboring cells
D) Mutation in the p53 tumor suppressor gene
Answer: A
Rationale: Hypertrophy is an increase in cell size due to increased workload and growth factors. Hyperplasia
involves increased cell number. Chronic inflammation can cause both, but the description fits hypertrophy. Loss of
trophic signals leads to atrophy. p53 mutation is associated with neoplasia.
10 Which of the following is a key difference between necrosis and apoptosis?
A) Necrosis is ATP-dependent, while apoptosis is ATP-independent
B) Apoptosis involves cell swelling, while necrosis involves cell shrinkage
C) Necrosis typically elicits an inflammatory response, while apoptosis does not
D) Apoptosis is always pathological, while necrosis is always physiological
Answer: C
Rationale: Necrosis releases cellular contents, triggering inflammation; apoptosis involves orderly dismantling
without inflammation. Apoptosis is ATP-dependent; necrosis is not. Apoptosis features cell shrinkage, necrosis
features swelling. Both can be physiological or pathological depending on context.
11 A researcher is studying the effects of a novel chemotherapeutic agent that inhibits topoisomerase II. In a cell
culture model, exposure to the drug leads to increased expression of p53 and activation of the intrinsic
apoptotic pathway. However, in a subset of cells with a mutation in the gene encoding Bax, the drug fails to
induce apoptosis, and these cells instead exhibit a marked increase in cell size with an expanded endoplasmic
reticulum and accumulation of polyubiquitinated proteins. Which of the following best describes the cellular
adaptation occurring in the Bax-mutant cells?
A) Apoptosis resistance due to defective mitochondrial outer membrane permeabilization
B) Hypertrophy secondary to endoplasmic reticulum stress and impaired autophagy
C) Hyperplasia driven by compensatory proliferation signals
D) Dysplasia characterized by loss of cellular uniformity and architectural disorganization
Answer: B
Rationale: The cells exhibit increased size, expanded ER, and accumulation of polyubiquitinated proteins, which are
hallmarks of cellular hypertrophy due to ER stress and impaired proteasomal/autophagic clearance. Option A
describes a molecular mechanism but not the adaptive cellular response. Hyperplasia (C) involves increased cell
number, not size. Dysplasia (D) is a deranged growth pattern, not simply increased cell size.
12 In a study of chronic ischemia in cardiac myocytes, researchers observe that cells initially undergo a reversible
adaptation characterized by increased expression of hypoxia-inducible factor 1 (HIF-1) and upregulation of
glycolytic enzymes. However, with persistent ischemia, some myocytes develop intracellular lipid droplets and
accumulate lipofuscin granules. Which of the following best describes the sequence of cellular adaptations in
this scenario?
A) Atrophy followed by intracellular accumulation
B) Metabolic adaptation (cellular adaptation) followed by pathologic intracellular accumulation
C) Hyperplasia followed by dysplasia
