GCU NUR-641E / NUR 641E: ADVANCED PATHOPHYSIOLOGY ESSENTIALS
| GRAND CANYON UNIVERSITY TEST QUESTIONS AND 100% VERIFIED
ANSWERS LATEST VERSION 2026/2027 (PASS GUARANTEE)
1. What is the primary mechanism of cellular injury in hypoxia? ANSWER :
Decreased ATP production due to lack of oxygen for oxidative phosphorylation,
leading to cellular swelling, membrane damage, and eventual cell death.
2. What is the difference between necrosis and apoptosis? ANSWER :
Necrosis is unregulated, pathological cell death caused by external factors
(injury, toxins) with inflammation; apoptosis is programmed, regulated cell
death without inflammation.
3. What is the role of free radicals in cellular injury? ANSWER : Free radicals
are unstable molecules with unpaired electrons that damage lipids, proteins,
and DNA through oxidative stress, contributing to aging, cancer, and
inflammatory diseases.
4. What is reperfusion injury? ANSWER : Damage that occurs when blood
supply returns to tissue after ischemia, caused by calcium overload, free
radical generation, and inflammatory responses.
5. What is the difference between metaplasia and dysplasia? ANSWER :
Metaplasia is a reversible change where one mature cell type is replaced by
another; dysplasia is abnormal cell development with loss of uniformity and
architectural organization, often precancerous.
6. What is a prodrug? ANSWER : A pharmacologically inactive compound that
is metabolized in the body to produce an active drug.
7. What is bioavailability? ANSWER : The proportion of a drug that reaches
systemic circulation unchanged after administration, affected by absorption,
first-pass metabolism, and formulation.
,8. What is steady state of a drug? ANSWER : The point at which drug
administration equals drug elimination, resulting in stable plasma
concentrations; typically reached after 4-5 half-lives.
9. What blood type would a person have who is heterozygous with A and B
alleles as codominant? ANSWER : AB blood type (Type AB), as both A and B
alleles are expressed equally.
10. What is the function of tumor suppressor genes? ANSWER : They regulate
cell cycle, promote DNA repair, and initiate apoptosis to prevent uncontrolled
cell growth; mutations can lead to cancer.
11. What is the p53 gene and its significance? ANSWER : The "guardian of the
genome," p53 detects DNA damage, arrests the cell cycle for repair, or triggers
apoptosis if damage is irreparable.
12. What is oncogene activation? ANSWER : Mutations in proto-oncogenes
that cause them to become overactive, promoting excessive cell proliferation
and potentially leading to cancer.
13. What is the difference between penetrance and expressivity? ANSWER :
Penetrance is the proportion of individuals with a mutation who exhibit the
phenotype; expressivity is the severity or variation of the phenotype among
affected individuals.
14. What is epigenetics? ANSWER : Heritable changes in gene expression that
do not involve DNA sequence alterations, including DNA methylation and
histone modification.
15. What is the role of telomeres in cellular aging? ANSWER : Telomeres
protect chromosome ends; they shorten with each cell division, eventually
triggering cellular senescence when critically short.
16. What is autophagy? ANSWER : A cellular process where damaged
organelles and proteins are degraded and recycled by lysosomes to maintain
cellular homeostasis.
17. What is the unfolded protein response (UPR)? ANSWER : A cellular stress
response triggered by accumulation of misfolded proteins in the endoplasmic
reticulum, aiming to restore protein folding capacity or induce apoptosis.
,18. What is the difference between hypertrophy and hyperplasia? ANSWER :
Hypertrophy is increase in cell size; hyperplasia is increase in cell number. Both
result in tissue enlargement but through different mechanisms.
19. What is atrophy and what causes it? ANSWER : Decrease in cell size due
to reduced workload, decreased blood supply, inadequate nutrition, or loss of
hormonal/neural stimulation.
20. What is the role of caspases in apoptosis? ANSWER : Cysteine-aspartic
proteases that execute apoptosis by cleaving cellular proteins, activated
through intrinsic (mitochondrial) or extrinsic (death receptor) pathways.
21. What is the Warburg effect? ANSWER : Cancer cells' preference for
aerobic glycolysis over oxidative phosphorylation, even in oxygen presence,
providing rapid ATP and biosynthetic precursors.
22. What is cellular adaptation to chronic hypoxia? ANSWER : Increased
erythropoietin production, increased 2,3-BPG synthesis (right-shifts
oxyhemoglobin curve), and angiogenesis through HIF-1α stabilization.
23. What is the difference between reversible and irreversible cell injury?
ANSWER : Reversible injury shows cellular swelling, fatty change, and
decreased ATP; irreversible injury involves membrane damage, mitochondrial
dysfunction, and lysosomal rupture.
24. What is the role of heat shock proteins? ANSWER : Molecular chaperones
that protect cells from stress by stabilizing unfolded proteins, preventing
aggregation, and assisting proper protein folding.
25. What is ferroptosis? ANSWER : An iron-dependent form of regulated cell
death characterized by lipid peroxidation and distinct from apoptosis, necrosis,
or autophagy.
SECTION 2: IMMUNOLOGY & INFLAMMATION (Questions 26-50)
26. What is the difference between innate and adaptive immunity? ANSWER
: Innate immunity is immediate, non-specific (first line of defense); adaptive
immunity is delayed, specific, and has memory (B and T cells).
27. What are the cardinal signs of acute inflammation? ANSWER : Rubor
(redness), tumor (swelling), calor (heat), dolor (pain), and functio laesa (loss of
function).
, 28. What is the role of histamine in inflammation? ANSWER : Released by
mast cells and basophils, causes vasodilation, increased vascular permeability,
and bronchoconstriction through H1 and H2 receptors.
29. What is the complement system and its activation pathways? ANSWER :
A cascade of plasma proteins that enhance immune responses; activated by
classical (antigen-antibody), alternative (microbial surfaces), and lectin
(mannose-binding lectin) pathways.
30. What is the difference between chemotaxis and opsonization? ANSWER :
Chemotaxis is movement of cells toward chemical gradients; opsonization is
coating pathogens with molecules (antibodies, complement) to enhance
phagocytosis.
31. What is the role of cytokines in inflammation? ANSWER : Signaling
molecules (IL-1, IL-6, TNF-α) that mediate communication between immune
cells, regulate inflammation, fever, and acute phase responses.
32. What is the difference between acute and chronic inflammation?
ANSWER : Acute is rapid onset, short duration, neutrophil-predominant;
chronic is prolonged, macrophage/lymphocyte-predominant, with tissue
destruction and fibrosis.
33. What is a granuloma? ANSWER : A focal collection of activated
macrophages (epithelioid cells) surrounded by lymphocytes, formed in
response to persistent indigestible pathogens or foreign material.
34. What is the difference between type I and type II hypersensitivity?
ANSWER : Type I is IgE-mediated immediate hypersensitivity (anaphylaxis,
allergies); Type II is cytotoxic antibody-mediated (autoimmune hemolytic
anemia).
35. What is type III hypersensitivity? ANSWER : Immune complex-mediated
hypersensitivity where antigen-antibody complexes deposit in tissues,
activating complement and causing inflammation (SLE, serum sickness).
36. What is type IV hypersensitivity? ANSWER : Delayed-type, T-cell-
mediated hypersensitivity (no antibody involvement), occurring 24-72 hours
after exposure (contact dermatitis, TB skin test).
37. What is the role of regulatory T cells (Tregs)? ANSWER : CD4+ T cells that
suppress immune responses, maintain self-tolerance, and prevent
autoimmune diseases through IL-10 and TGF-β production.
| GRAND CANYON UNIVERSITY TEST QUESTIONS AND 100% VERIFIED
ANSWERS LATEST VERSION 2026/2027 (PASS GUARANTEE)
1. What is the primary mechanism of cellular injury in hypoxia? ANSWER :
Decreased ATP production due to lack of oxygen for oxidative phosphorylation,
leading to cellular swelling, membrane damage, and eventual cell death.
2. What is the difference between necrosis and apoptosis? ANSWER :
Necrosis is unregulated, pathological cell death caused by external factors
(injury, toxins) with inflammation; apoptosis is programmed, regulated cell
death without inflammation.
3. What is the role of free radicals in cellular injury? ANSWER : Free radicals
are unstable molecules with unpaired electrons that damage lipids, proteins,
and DNA through oxidative stress, contributing to aging, cancer, and
inflammatory diseases.
4. What is reperfusion injury? ANSWER : Damage that occurs when blood
supply returns to tissue after ischemia, caused by calcium overload, free
radical generation, and inflammatory responses.
5. What is the difference between metaplasia and dysplasia? ANSWER :
Metaplasia is a reversible change where one mature cell type is replaced by
another; dysplasia is abnormal cell development with loss of uniformity and
architectural organization, often precancerous.
6. What is a prodrug? ANSWER : A pharmacologically inactive compound that
is metabolized in the body to produce an active drug.
7. What is bioavailability? ANSWER : The proportion of a drug that reaches
systemic circulation unchanged after administration, affected by absorption,
first-pass metabolism, and formulation.
,8. What is steady state of a drug? ANSWER : The point at which drug
administration equals drug elimination, resulting in stable plasma
concentrations; typically reached after 4-5 half-lives.
9. What blood type would a person have who is heterozygous with A and B
alleles as codominant? ANSWER : AB blood type (Type AB), as both A and B
alleles are expressed equally.
10. What is the function of tumor suppressor genes? ANSWER : They regulate
cell cycle, promote DNA repair, and initiate apoptosis to prevent uncontrolled
cell growth; mutations can lead to cancer.
11. What is the p53 gene and its significance? ANSWER : The "guardian of the
genome," p53 detects DNA damage, arrests the cell cycle for repair, or triggers
apoptosis if damage is irreparable.
12. What is oncogene activation? ANSWER : Mutations in proto-oncogenes
that cause them to become overactive, promoting excessive cell proliferation
and potentially leading to cancer.
13. What is the difference between penetrance and expressivity? ANSWER :
Penetrance is the proportion of individuals with a mutation who exhibit the
phenotype; expressivity is the severity or variation of the phenotype among
affected individuals.
14. What is epigenetics? ANSWER : Heritable changes in gene expression that
do not involve DNA sequence alterations, including DNA methylation and
histone modification.
15. What is the role of telomeres in cellular aging? ANSWER : Telomeres
protect chromosome ends; they shorten with each cell division, eventually
triggering cellular senescence when critically short.
16. What is autophagy? ANSWER : A cellular process where damaged
organelles and proteins are degraded and recycled by lysosomes to maintain
cellular homeostasis.
17. What is the unfolded protein response (UPR)? ANSWER : A cellular stress
response triggered by accumulation of misfolded proteins in the endoplasmic
reticulum, aiming to restore protein folding capacity or induce apoptosis.
,18. What is the difference between hypertrophy and hyperplasia? ANSWER :
Hypertrophy is increase in cell size; hyperplasia is increase in cell number. Both
result in tissue enlargement but through different mechanisms.
19. What is atrophy and what causes it? ANSWER : Decrease in cell size due
to reduced workload, decreased blood supply, inadequate nutrition, or loss of
hormonal/neural stimulation.
20. What is the role of caspases in apoptosis? ANSWER : Cysteine-aspartic
proteases that execute apoptosis by cleaving cellular proteins, activated
through intrinsic (mitochondrial) or extrinsic (death receptor) pathways.
21. What is the Warburg effect? ANSWER : Cancer cells' preference for
aerobic glycolysis over oxidative phosphorylation, even in oxygen presence,
providing rapid ATP and biosynthetic precursors.
22. What is cellular adaptation to chronic hypoxia? ANSWER : Increased
erythropoietin production, increased 2,3-BPG synthesis (right-shifts
oxyhemoglobin curve), and angiogenesis through HIF-1α stabilization.
23. What is the difference between reversible and irreversible cell injury?
ANSWER : Reversible injury shows cellular swelling, fatty change, and
decreased ATP; irreversible injury involves membrane damage, mitochondrial
dysfunction, and lysosomal rupture.
24. What is the role of heat shock proteins? ANSWER : Molecular chaperones
that protect cells from stress by stabilizing unfolded proteins, preventing
aggregation, and assisting proper protein folding.
25. What is ferroptosis? ANSWER : An iron-dependent form of regulated cell
death characterized by lipid peroxidation and distinct from apoptosis, necrosis,
or autophagy.
SECTION 2: IMMUNOLOGY & INFLAMMATION (Questions 26-50)
26. What is the difference between innate and adaptive immunity? ANSWER
: Innate immunity is immediate, non-specific (first line of defense); adaptive
immunity is delayed, specific, and has memory (B and T cells).
27. What are the cardinal signs of acute inflammation? ANSWER : Rubor
(redness), tumor (swelling), calor (heat), dolor (pain), and functio laesa (loss of
function).
, 28. What is the role of histamine in inflammation? ANSWER : Released by
mast cells and basophils, causes vasodilation, increased vascular permeability,
and bronchoconstriction through H1 and H2 receptors.
29. What is the complement system and its activation pathways? ANSWER :
A cascade of plasma proteins that enhance immune responses; activated by
classical (antigen-antibody), alternative (microbial surfaces), and lectin
(mannose-binding lectin) pathways.
30. What is the difference between chemotaxis and opsonization? ANSWER :
Chemotaxis is movement of cells toward chemical gradients; opsonization is
coating pathogens with molecules (antibodies, complement) to enhance
phagocytosis.
31. What is the role of cytokines in inflammation? ANSWER : Signaling
molecules (IL-1, IL-6, TNF-α) that mediate communication between immune
cells, regulate inflammation, fever, and acute phase responses.
32. What is the difference between acute and chronic inflammation?
ANSWER : Acute is rapid onset, short duration, neutrophil-predominant;
chronic is prolonged, macrophage/lymphocyte-predominant, with tissue
destruction and fibrosis.
33. What is a granuloma? ANSWER : A focal collection of activated
macrophages (epithelioid cells) surrounded by lymphocytes, formed in
response to persistent indigestible pathogens or foreign material.
34. What is the difference between type I and type II hypersensitivity?
ANSWER : Type I is IgE-mediated immediate hypersensitivity (anaphylaxis,
allergies); Type II is cytotoxic antibody-mediated (autoimmune hemolytic
anemia).
35. What is type III hypersensitivity? ANSWER : Immune complex-mediated
hypersensitivity where antigen-antibody complexes deposit in tissues,
activating complement and causing inflammation (SLE, serum sickness).
36. What is type IV hypersensitivity? ANSWER : Delayed-type, T-cell-
mediated hypersensitivity (no antibody involvement), occurring 24-72 hours
after exposure (contact dermatitis, TB skin test).
37. What is the role of regulatory T cells (Tregs)? ANSWER : CD4+ T cells that
suppress immune responses, maintain self-tolerance, and prevent
autoimmune diseases through IL-10 and TGF-β production.
