NR 341 PATHOPHYSIOLOGY EXAM QUESTIONS AND
100% VERIFIED ANSWERS; ENSURING CONFIDENCE
AND ACCURACY IN YOUR TEST PREPARATION
300 QUESTIONS AND ANSWERS
1. Q: What is the primary function of the cell membrane? A: The cell
membrane regulates the passage of substances into and out of the cell,
maintaining cellular homeostasis through selective permeability.
2. Q: What happens during cellular hypoxia? A: Cellular hypoxia occurs
when cells receive inadequate oxygen, leading to anaerobic metabolism, ATP
depletion, and potential cell death if prolonged.
3. Q: Define cellular adaptation. A: Cellular adaptation refers to reversible
changes in cell size, number, phenotype, or metabolic activity in response to
environmental stress or altered physiological demands.
4. Q: What is hypertrophy? A: Hypertrophy is an increase in cell size due to
increased workload or hormonal stimulation, resulting in enlarged organ size
without an increase in cell number.
5. Q: What is hyperplasia? A: Hyperplasia is an increase in the number of
cells in response to stimuli, resulting in enlarged tissue or organ size.
6. Q: Define atrophy. A: Atrophy is a decrease in cell size and number, leading
to reduced tissue mass, often due to disuse, aging, or loss of trophic signals.
7. Q: What is metaplasia? A: Metaplasia is the replacement of one
differentiated cell type with another mature differentiated cell type, usually in
response to chronic irritation.
8. Q: What is dysplasia? A: Dysplasia is abnormal cellular development
characterized by loss of uniformity and orientation, often considered a
precancerous condition.
9. Q: What are the main types of cell death? A: The main types are necrosis
(uncontrolled cell death due to injury) and apoptosis (programmed cell death).
,10. Q: What is ischemia? A: Ischemia is reduced blood flow to tissues,
resulting in decreased oxygen and nutrient delivery, potentially leading to tissue
damage.
11. Q: What causes cellular swelling? A: Cellular swelling results from ATP
depletion, leading to failure of the sodium-potassium pump and subsequent
water accumulation in cells.
12. Q: What is reperfusion injury? A: Reperfusion injury occurs when blood
flow is restored to ischemic tissue, causing additional damage through oxygen
free radical formation and inflammatory responses.
13. Q: Define oxidative stress. A: Oxidative stress occurs when there's an
imbalance between reactive oxygen species production and the body's
antioxidant defenses, leading to cellular damage.
14. Q: What are heat shock proteins? A: Heat shock proteins are cellular
proteins that help protect cells from stress by assisting in protein folding and
preventing protein aggregation.
15. Q: What is the difference between oncosis and apoptosis? A: Oncosis
involves cell swelling and membrane disruption (necrotic pathway), while
apoptosis involves cell shrinkage and controlled dismantling without
inflammation.
16. Q: What role do free radicals play in cellular injury? A: Free radicals
cause cellular injury by damaging lipids, proteins, and DNA through oxidation
reactions, contributing to aging and disease processes.
17. Q: What is autophagy? A: Autophagy is a cellular process where cells
digest their own organelles and proteins to recycle nutrients during stress or
starvation.
18. Q: How do cells respond to hyperthermia? A: Cells respond to
hyperthermia by producing heat shock proteins, altering metabolism, and
potentially undergoing apoptosis if temperatures are extreme.
19. Q: What is the role of calcium in cellular injury? A: Excessive
intracellular calcium activates destructive enzymes, damages mitochondria, and
triggers cell death pathways.
20. Q: What are the characteristics of reversible cell injury? A: Reversible
cell injury includes cellular swelling, loss of microvilli, membrane blebbing,
and mitochondrial swelling, but maintains membrane integrity.
, 21. Q: What is lipofuscin? A: Lipofuscin is a yellowish-brown pigment that
accumulates in aging cells, composed of oxidized lipids and proteins that cannot
be digested.
22. Q: How does chronic inflammation differ from acute inflammation at
the cellular level? A: Chronic inflammation involves lymphocytes and
macrophages with tissue destruction and repair occurring simultaneously, unlike
acute inflammation's neutrophil-dominated response.
23. Q: What is cellular senescence? A: Cellular senescence is the permanent
loss of proliferative capacity in cells, often triggered by DNA damage or
telomere shortening.
24. Q: What happens during mitochondrial dysfunction? A: Mitochondrial
dysfunction results in decreased ATP production, increased reactive oxygen
species, and potential triggering of apoptotic pathways.
25. Q: What is the unfolded protein response? A: The unfolded protein
response is a cellular stress response activated when misfolded proteins
accumulate in the endoplasmic reticulum.
Inflammation and Immunity (Questions 26-75)
26. Q: What are the five cardinal signs of inflammation? A: The five
cardinal signs are rubor (redness), calor (heat), dolor (pain), tumor (swelling),
and functio laesa (loss of function).
27. Q: What initiates the inflammatory response? A: Inflammation is
initiated by tissue injury, infection, or irritants that trigger the release of
inflammatory mediators from cells and plasma proteins.
28. Q: What is the role of histamine in inflammation? A: Histamine causes
vasodilation and increased vascular permeability, contributing to redness, heat,
and swelling in acute inflammation.
29. Q: What are prostaglandins and their role in inflammation? A:
Prostaglandins are lipid mediators that cause vasodilation, increase vascular
permeability, and sensitize pain receptors during inflammation.
30. Q: What is the complement system? A: The complement system is a
cascade of plasma proteins that enhances immune responses through
opsonization, membrane attack, and inflammatory mediator release.
31. Q: What are the three pathways of complement activation? A: The three
pathways are classical (antibody-mediated), alternative (direct pathogen
recognition), and lectin (mannose-binding lectin) pathways.
100% VERIFIED ANSWERS; ENSURING CONFIDENCE
AND ACCURACY IN YOUR TEST PREPARATION
300 QUESTIONS AND ANSWERS
1. Q: What is the primary function of the cell membrane? A: The cell
membrane regulates the passage of substances into and out of the cell,
maintaining cellular homeostasis through selective permeability.
2. Q: What happens during cellular hypoxia? A: Cellular hypoxia occurs
when cells receive inadequate oxygen, leading to anaerobic metabolism, ATP
depletion, and potential cell death if prolonged.
3. Q: Define cellular adaptation. A: Cellular adaptation refers to reversible
changes in cell size, number, phenotype, or metabolic activity in response to
environmental stress or altered physiological demands.
4. Q: What is hypertrophy? A: Hypertrophy is an increase in cell size due to
increased workload or hormonal stimulation, resulting in enlarged organ size
without an increase in cell number.
5. Q: What is hyperplasia? A: Hyperplasia is an increase in the number of
cells in response to stimuli, resulting in enlarged tissue or organ size.
6. Q: Define atrophy. A: Atrophy is a decrease in cell size and number, leading
to reduced tissue mass, often due to disuse, aging, or loss of trophic signals.
7. Q: What is metaplasia? A: Metaplasia is the replacement of one
differentiated cell type with another mature differentiated cell type, usually in
response to chronic irritation.
8. Q: What is dysplasia? A: Dysplasia is abnormal cellular development
characterized by loss of uniformity and orientation, often considered a
precancerous condition.
9. Q: What are the main types of cell death? A: The main types are necrosis
(uncontrolled cell death due to injury) and apoptosis (programmed cell death).
,10. Q: What is ischemia? A: Ischemia is reduced blood flow to tissues,
resulting in decreased oxygen and nutrient delivery, potentially leading to tissue
damage.
11. Q: What causes cellular swelling? A: Cellular swelling results from ATP
depletion, leading to failure of the sodium-potassium pump and subsequent
water accumulation in cells.
12. Q: What is reperfusion injury? A: Reperfusion injury occurs when blood
flow is restored to ischemic tissue, causing additional damage through oxygen
free radical formation and inflammatory responses.
13. Q: Define oxidative stress. A: Oxidative stress occurs when there's an
imbalance between reactive oxygen species production and the body's
antioxidant defenses, leading to cellular damage.
14. Q: What are heat shock proteins? A: Heat shock proteins are cellular
proteins that help protect cells from stress by assisting in protein folding and
preventing protein aggregation.
15. Q: What is the difference between oncosis and apoptosis? A: Oncosis
involves cell swelling and membrane disruption (necrotic pathway), while
apoptosis involves cell shrinkage and controlled dismantling without
inflammation.
16. Q: What role do free radicals play in cellular injury? A: Free radicals
cause cellular injury by damaging lipids, proteins, and DNA through oxidation
reactions, contributing to aging and disease processes.
17. Q: What is autophagy? A: Autophagy is a cellular process where cells
digest their own organelles and proteins to recycle nutrients during stress or
starvation.
18. Q: How do cells respond to hyperthermia? A: Cells respond to
hyperthermia by producing heat shock proteins, altering metabolism, and
potentially undergoing apoptosis if temperatures are extreme.
19. Q: What is the role of calcium in cellular injury? A: Excessive
intracellular calcium activates destructive enzymes, damages mitochondria, and
triggers cell death pathways.
20. Q: What are the characteristics of reversible cell injury? A: Reversible
cell injury includes cellular swelling, loss of microvilli, membrane blebbing,
and mitochondrial swelling, but maintains membrane integrity.
, 21. Q: What is lipofuscin? A: Lipofuscin is a yellowish-brown pigment that
accumulates in aging cells, composed of oxidized lipids and proteins that cannot
be digested.
22. Q: How does chronic inflammation differ from acute inflammation at
the cellular level? A: Chronic inflammation involves lymphocytes and
macrophages with tissue destruction and repair occurring simultaneously, unlike
acute inflammation's neutrophil-dominated response.
23. Q: What is cellular senescence? A: Cellular senescence is the permanent
loss of proliferative capacity in cells, often triggered by DNA damage or
telomere shortening.
24. Q: What happens during mitochondrial dysfunction? A: Mitochondrial
dysfunction results in decreased ATP production, increased reactive oxygen
species, and potential triggering of apoptotic pathways.
25. Q: What is the unfolded protein response? A: The unfolded protein
response is a cellular stress response activated when misfolded proteins
accumulate in the endoplasmic reticulum.
Inflammation and Immunity (Questions 26-75)
26. Q: What are the five cardinal signs of inflammation? A: The five
cardinal signs are rubor (redness), calor (heat), dolor (pain), tumor (swelling),
and functio laesa (loss of function).
27. Q: What initiates the inflammatory response? A: Inflammation is
initiated by tissue injury, infection, or irritants that trigger the release of
inflammatory mediators from cells and plasma proteins.
28. Q: What is the role of histamine in inflammation? A: Histamine causes
vasodilation and increased vascular permeability, contributing to redness, heat,
and swelling in acute inflammation.
29. Q: What are prostaglandins and their role in inflammation? A:
Prostaglandins are lipid mediators that cause vasodilation, increase vascular
permeability, and sensitize pain receptors during inflammation.
30. Q: What is the complement system? A: The complement system is a
cascade of plasma proteins that enhances immune responses through
opsonization, membrane attack, and inflammatory mediator release.
31. Q: What are the three pathways of complement activation? A: The three
pathways are classical (antibody-mediated), alternative (direct pathogen
recognition), and lectin (mannose-binding lectin) pathways.
