WGU D236 Objective Assessment
Pathophysiology Exam Practice
Questions & [Verified Answers], Plus
Explained Rationales|2027 Latest
Update| Instant Download Pdf
1. A patient develops edema because of severe hypoalbuminemia.
Which mechanism best explains the edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased lymphatic drainage
D. Decreased capillary permeability
Answer: B. Decreased plasma oncotic pressure
Rationale: Albumin is the major plasma protein responsible for
maintaining colloid osmotic pressure within the vascular space. When
albumin levels fall, plasma oncotic pressure decreases, allowing more
fluid to move from the intravascular space into the interstitial tissues,
producing edema.
2. A patient with left-sided heart failure develops shortness of breath
and crackles. Which pathophysiologic process is primarily
responsible?
A. Increased systemic venous pressure
B. Decreased pulmonary vascular resistance
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,C. Increased pulmonary capillary hydrostatic pressure
D. Reduced pulmonary blood flow
Answer: C. Increased pulmonary capillary hydrostatic pressure
Rationale: Left ventricular dysfunction causes blood to back up into
the pulmonary circulation. Increased pulmonary capillary hydrostatic
pressure forces fluid into the pulmonary interstitium and alveoli,
producing pulmonary edema, crackles, and impaired gas exchange.
3. Which cellular adaptation occurs when a skeletal muscle increases
in size because of resistance training?
A. Hyperplasia
B. Atrophy
C. Hypertrophy
D. Metaplasia
Answer: C. Hypertrophy
Rationale: Hypertrophy is an increase in the size of existing cells.
Skeletal muscle commonly enlarges through hypertrophy when
exposed to increased workload. Hyperplasia involves an increase in
cell number.
4. A patient experiences prolonged ischemia in a tissue. Which cellular
process is most directly associated with irreversible cell injury?
A. Temporary reduction in ATP production
B. Mild cellular swelling
C. Severe mitochondrial and membrane damage
D. Reversible fatty accumulation
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,Answer: C. Severe mitochondrial and membrane damage
Rationale: Irreversible cell injury occurs when damage becomes
sufficiently severe to prevent restoration of mitochondrial function
and membrane integrity. Loss of membrane integrity allows cellular
contents to leak and is characteristic of cell death.
5. Which inflammatory mediator is strongly associated with
vasodilation and increased vascular permeability during acute
inflammation?
A. Histamine
B. Albumin
C. Hemoglobin
D. Insulin
Answer: A. Histamine
Rationale: Histamine is released primarily from mast cells during
acute inflammation. It promotes arteriolar vasodilation and increases
vascular permeability, contributing to redness, warmth, swelling, and
fluid accumulation.
6. A patient has a fever during an acute infection. What mechanism
most directly causes the elevated body temperature?
A. Destruction of the hypothalamus
B. Cytokine-mediated elevation of the hypothalamic set point
C. Increased renal water excretion
D. Decreased sympathetic activity
Answer: B. Cytokine-mediated elevation of the hypothalamic set
point
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, Rationale: Pyrogenic cytokines such as interleukin-1 and tumor
necrosis factor stimulate prostaglandin production in the
hypothalamus, raising the thermoregulatory set point. The body then
generates and conserves heat until the new set point is reached.
7. Which laboratory finding is most consistent with a bacterial
infection causing an acute inflammatory response?
A. Neutrophilia
B. Severe lymphopenia only
C. Decreased fibrinogen
D. Decreased acute-phase proteins
Answer: A. Neutrophilia
Rationale: Neutrophils are the predominant leukocytes involved in
many acute bacterial infections. The bone marrow releases additional
neutrophils in response to inflammatory signals, producing
neutrophilia.
8. A patient develops wheezing and airway narrowing after exposure
to an allergen. Which immune mechanism is primarily responsible?
A. IgE-mediated mast-cell activation
B. IgG destruction of red blood cells
C. T-cell destruction of pancreatic cells
D. Immune-complex deposition in joints
Answer: A. IgE-mediated mast-cell activation
Rationale: Type I hypersensitivity reactions involve allergen-specific
IgE antibodies bound to mast cells. Re-exposure causes mast-cell
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Pathophysiology Exam Practice
Questions & [Verified Answers], Plus
Explained Rationales|2027 Latest
Update| Instant Download Pdf
1. A patient develops edema because of severe hypoalbuminemia.
Which mechanism best explains the edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased lymphatic drainage
D. Decreased capillary permeability
Answer: B. Decreased plasma oncotic pressure
Rationale: Albumin is the major plasma protein responsible for
maintaining colloid osmotic pressure within the vascular space. When
albumin levels fall, plasma oncotic pressure decreases, allowing more
fluid to move from the intravascular space into the interstitial tissues,
producing edema.
2. A patient with left-sided heart failure develops shortness of breath
and crackles. Which pathophysiologic process is primarily
responsible?
A. Increased systemic venous pressure
B. Decreased pulmonary vascular resistance
1|Page
,C. Increased pulmonary capillary hydrostatic pressure
D. Reduced pulmonary blood flow
Answer: C. Increased pulmonary capillary hydrostatic pressure
Rationale: Left ventricular dysfunction causes blood to back up into
the pulmonary circulation. Increased pulmonary capillary hydrostatic
pressure forces fluid into the pulmonary interstitium and alveoli,
producing pulmonary edema, crackles, and impaired gas exchange.
3. Which cellular adaptation occurs when a skeletal muscle increases
in size because of resistance training?
A. Hyperplasia
B. Atrophy
C. Hypertrophy
D. Metaplasia
Answer: C. Hypertrophy
Rationale: Hypertrophy is an increase in the size of existing cells.
Skeletal muscle commonly enlarges through hypertrophy when
exposed to increased workload. Hyperplasia involves an increase in
cell number.
4. A patient experiences prolonged ischemia in a tissue. Which cellular
process is most directly associated with irreversible cell injury?
A. Temporary reduction in ATP production
B. Mild cellular swelling
C. Severe mitochondrial and membrane damage
D. Reversible fatty accumulation
2|Page
,Answer: C. Severe mitochondrial and membrane damage
Rationale: Irreversible cell injury occurs when damage becomes
sufficiently severe to prevent restoration of mitochondrial function
and membrane integrity. Loss of membrane integrity allows cellular
contents to leak and is characteristic of cell death.
5. Which inflammatory mediator is strongly associated with
vasodilation and increased vascular permeability during acute
inflammation?
A. Histamine
B. Albumin
C. Hemoglobin
D. Insulin
Answer: A. Histamine
Rationale: Histamine is released primarily from mast cells during
acute inflammation. It promotes arteriolar vasodilation and increases
vascular permeability, contributing to redness, warmth, swelling, and
fluid accumulation.
6. A patient has a fever during an acute infection. What mechanism
most directly causes the elevated body temperature?
A. Destruction of the hypothalamus
B. Cytokine-mediated elevation of the hypothalamic set point
C. Increased renal water excretion
D. Decreased sympathetic activity
Answer: B. Cytokine-mediated elevation of the hypothalamic set
point
3|Page
, Rationale: Pyrogenic cytokines such as interleukin-1 and tumor
necrosis factor stimulate prostaglandin production in the
hypothalamus, raising the thermoregulatory set point. The body then
generates and conserves heat until the new set point is reached.
7. Which laboratory finding is most consistent with a bacterial
infection causing an acute inflammatory response?
A. Neutrophilia
B. Severe lymphopenia only
C. Decreased fibrinogen
D. Decreased acute-phase proteins
Answer: A. Neutrophilia
Rationale: Neutrophils are the predominant leukocytes involved in
many acute bacterial infections. The bone marrow releases additional
neutrophils in response to inflammatory signals, producing
neutrophilia.
8. A patient develops wheezing and airway narrowing after exposure
to an allergen. Which immune mechanism is primarily responsible?
A. IgE-mediated mast-cell activation
B. IgG destruction of red blood cells
C. T-cell destruction of pancreatic cells
D. Immune-complex deposition in joints
Answer: A. IgE-mediated mast-cell activation
Rationale: Type I hypersensitivity reactions involve allergen-specific
IgE antibodies bound to mast cells. Re-exposure causes mast-cell
4|Page
