WGU D236 Pathophysiology Exam Actual
Exam 2026/2027 – Complete Exam-Style
Questions | Detailed Rationales – Pass
Guaranteed – A+ Graded
Q1. What is Starling's Law of Capillary forces? How does this explain
why a nutritionally deficient child would have edema?
• A) High hydrostatic pressure pushes fluid out of capillaries;
malnutrition increases hydrostatic pressure
• B) Low plasma proteins decrease osmotic pressure, causing
fluid to leave capillaries and accumulate in interstitial space
• C) High plasma proteins increase osmotic pressure, pulling
fluid into interstitial space
• D) Malnutrition causes increased capillary permeability,
allowing protein leakage
Correct ,,,answer,,,,: B) Low plasma proteins decrease osmotic
pressure, causing fluid to leave capillaries and accumulate in
interstitial space
Rationale: Starling's Law describes fluid movement across capillary
membranes balancing hydrostatic pressure (pushing fluid out) and
osmotic pressure (pulling fluid in). Osmotic pressure is largely
maintained by plasma proteins (albumin). A nutritionally deficient
child has low plasma protein levels, which decreases osmotic
,pressure, allowing fluid to leave the capillaries and accumulate in
interstitial space, causing edema .
Q2. How does the RAAS (Renin-Angiotensin-Aldosterone System)
result in increased blood volume and increased blood pressure?
• A) Vasodilation and decreased sodium reabsorption
• B) Increased urine output and sodium excretion
• C) Vasoconstriction and increased sodium/water reabsorption
• D) Decreased heart rate and peripheral resistance
Correct ,,,answer,,,,: C) Vasoconstriction and increased
sodium/water reabsorption
Rationale: A drop in blood pressure is sensed by the kidneys, which
release renin. Renin converts angiotensinogen to angiotensin I. ACE
converts angiotensin I to angiotensin II. Angiotensin II causes
vasoconstriction (↑ BP) and stimulates aldosterone release.
Aldosterone increases sodium and water reabsorption, increasing
blood volume .
Q3. How can hyperkalemia lead to cardiac arrest?
• A) By decreasing nerve impulse conduction in skeletal muscles
• B) By causing irregular heartbeat due to altered cardiac muscle
impulse conduction
• C) By increasing blood viscosity and thrombus formation
• D) By decreasing oxygen delivery to cardiac tissue
,Correct ,,,answer,,,,: B) By causing irregular heartbeat due to altered
cardiac muscle impulse conduction
Rationale: Normal potassium levels are 3.5-5.2 mEq/dL.
Hyperkalemia (>5.2 mEq/dL) is especially dangerous in cardiac
muscle because potassium conducts nerve impulses in muscles. Too
high levels can cause muscle spasms and irregular heartbeat that
can lead to cardiac arrest .
Q4. Which of the following is most characteristic of acute
inflammation?
• A) Decreased blood flow to the affected area
• B) Increased vascular permeability
• C) Decreased white blood cell migration
• D) Resolution without immune cell involvement
Correct ,,,answer,,,,: B) Increased vascular permeability
Rationale: Increased vascular permeability is the most characteristic
feature of acute inflammation because it allows rapid influx of white
blood cells, proteins, and immune mediators into the affected tissue,
essential for the initiation and resolution of the inflammatory
response .
Q5. The primary mechanism of action of non-steroidal anti-
inflammatory drugs (NSAIDs) is inhibition of which enzyme?
, • A) Lipoxygenase
• B) Cyclooxygenase (COX)
• C) Phospholipase A2
• D) Acetylcholinesterase
Correct ,,,answer,,,,: B) Cyclooxygenase (COX)
Rationale: NSAIDs exert their anti-inflammatory effects by binding
to and inhibiting the enzyme Cyclooxygenase (COX), which converts
arachidonic acid into prostaglandins and thromboxanes. By blocking
COX, NSAIDs prevent the production of these pro-inflammatory
mediators, reducing inflammation and pain .
Q6. Differentiate between Innate Immunity and Adaptive Immunity.
• A) Innate is specific with memory; Adaptive is non-specific
without memory
• B) Innate is non-specific without memory; Adaptive is specific
with memory
• C) Both are non-specific and lack memory
• D) Both are specific and have memory
Correct ,,,answer,,,,: B) Innate is non-specific without memory;
Adaptive is specific with memory
Rationale: Innate immunity encompasses physical barriers (skin,
mucous membranes) and chemical/cellular defenses that are non-
specific and present from birth. Adaptive immunity is acquired
immunity to specific pathogens, marked by clonal expansion of T
and B lymphocytes and immunological memory .
Exam 2026/2027 – Complete Exam-Style
Questions | Detailed Rationales – Pass
Guaranteed – A+ Graded
Q1. What is Starling's Law of Capillary forces? How does this explain
why a nutritionally deficient child would have edema?
• A) High hydrostatic pressure pushes fluid out of capillaries;
malnutrition increases hydrostatic pressure
• B) Low plasma proteins decrease osmotic pressure, causing
fluid to leave capillaries and accumulate in interstitial space
• C) High plasma proteins increase osmotic pressure, pulling
fluid into interstitial space
• D) Malnutrition causes increased capillary permeability,
allowing protein leakage
Correct ,,,answer,,,,: B) Low plasma proteins decrease osmotic
pressure, causing fluid to leave capillaries and accumulate in
interstitial space
Rationale: Starling's Law describes fluid movement across capillary
membranes balancing hydrostatic pressure (pushing fluid out) and
osmotic pressure (pulling fluid in). Osmotic pressure is largely
maintained by plasma proteins (albumin). A nutritionally deficient
child has low plasma protein levels, which decreases osmotic
,pressure, allowing fluid to leave the capillaries and accumulate in
interstitial space, causing edema .
Q2. How does the RAAS (Renin-Angiotensin-Aldosterone System)
result in increased blood volume and increased blood pressure?
• A) Vasodilation and decreased sodium reabsorption
• B) Increased urine output and sodium excretion
• C) Vasoconstriction and increased sodium/water reabsorption
• D) Decreased heart rate and peripheral resistance
Correct ,,,answer,,,,: C) Vasoconstriction and increased
sodium/water reabsorption
Rationale: A drop in blood pressure is sensed by the kidneys, which
release renin. Renin converts angiotensinogen to angiotensin I. ACE
converts angiotensin I to angiotensin II. Angiotensin II causes
vasoconstriction (↑ BP) and stimulates aldosterone release.
Aldosterone increases sodium and water reabsorption, increasing
blood volume .
Q3. How can hyperkalemia lead to cardiac arrest?
• A) By decreasing nerve impulse conduction in skeletal muscles
• B) By causing irregular heartbeat due to altered cardiac muscle
impulse conduction
• C) By increasing blood viscosity and thrombus formation
• D) By decreasing oxygen delivery to cardiac tissue
,Correct ,,,answer,,,,: B) By causing irregular heartbeat due to altered
cardiac muscle impulse conduction
Rationale: Normal potassium levels are 3.5-5.2 mEq/dL.
Hyperkalemia (>5.2 mEq/dL) is especially dangerous in cardiac
muscle because potassium conducts nerve impulses in muscles. Too
high levels can cause muscle spasms and irregular heartbeat that
can lead to cardiac arrest .
Q4. Which of the following is most characteristic of acute
inflammation?
• A) Decreased blood flow to the affected area
• B) Increased vascular permeability
• C) Decreased white blood cell migration
• D) Resolution without immune cell involvement
Correct ,,,answer,,,,: B) Increased vascular permeability
Rationale: Increased vascular permeability is the most characteristic
feature of acute inflammation because it allows rapid influx of white
blood cells, proteins, and immune mediators into the affected tissue,
essential for the initiation and resolution of the inflammatory
response .
Q5. The primary mechanism of action of non-steroidal anti-
inflammatory drugs (NSAIDs) is inhibition of which enzyme?
, • A) Lipoxygenase
• B) Cyclooxygenase (COX)
• C) Phospholipase A2
• D) Acetylcholinesterase
Correct ,,,answer,,,,: B) Cyclooxygenase (COX)
Rationale: NSAIDs exert their anti-inflammatory effects by binding
to and inhibiting the enzyme Cyclooxygenase (COX), which converts
arachidonic acid into prostaglandins and thromboxanes. By blocking
COX, NSAIDs prevent the production of these pro-inflammatory
mediators, reducing inflammation and pain .
Q6. Differentiate between Innate Immunity and Adaptive Immunity.
• A) Innate is specific with memory; Adaptive is non-specific
without memory
• B) Innate is non-specific without memory; Adaptive is specific
with memory
• C) Both are non-specific and lack memory
• D) Both are specific and have memory
Correct ,,,answer,,,,: B) Innate is non-specific without memory;
Adaptive is specific with memory
Rationale: Innate immunity encompasses physical barriers (skin,
mucous membranes) and chemical/cellular defenses that are non-
specific and present from birth. Adaptive immunity is acquired
immunity to specific pathogens, marked by clonal expansion of T
and B lymphocytes and immunological memory .
