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WGU D236 Pathophysiology Final Exam
Complete 300 Questions and Correct Detailed
Answers – Latest Update
Official Exam Overview:
The WGU D236 Final Exam evaluates learners’ mastery of pathophysiology concepts, including
systemic and cellular mechanisms of disease, homeostatic regulation, and clinical applications. The
exam emphasizes understanding organ system interactions, interpreting physiological data, and
explaining key compensatory processes.
Exam Coverage Areas:
• Renal, cardiovascular, and endocrine regulation
• Acid-base and electrolyte balance
• Immune, hematologic, and metabolic disorders
• Neurologic and musculoskeletal pathophysiology
• Homeostatic mechanisms and systemic compensatory responses
QUESTION 1:
Explain the Renin-Angiotensin-Aldosterone System (RAAS) and its role in blood pressure
regulation.
A) RAAS is a hormone system that decreases blood pressure
B) RAAS reduces blood flow by dilating vessels
C) RAAS regulates blood pressure and fluid balance ✅
D) RAAS primarily controls heart rate
Rationale:
RAAS is activated when renal perfusion decreases. Steps:
1. Kidneys release renin.
2. Renin converts angiotensinogen to angiotensin I.
3. ACE converts angiotensin I to angiotensin II.
4. Angiotensin II causes vasoconstriction and triggers aldosterone release.
5. Aldosterone promotes sodium and water retention, increasing blood volume.
Result: Blood pressure is maintained, and fluid balance is stabilized.
QUESTION 2:
Which organ primarily releases renin in the RAAS pathway?
,A) Liver
B) Adrenal glands
C) Kidneys ✅
D) Heart
Rationale:
The kidneys sense decreased perfusion or low sodium and release renin, which initiates the RAAS
cascade. The liver produces angiotensinogen, the adrenal glands release aldosterone, and the heart is
not the primary renin source.
QUESTION 3:
What is the main effect of angiotensin II on blood vessels?
A) Vasodilation
B) Vasoconstriction ✅
C) No effect
D) Decreased heart rate
Rationale:
Angiotensin II is a potent vasoconstrictor. It increases systemic vascular resistance, raising blood
pressure, and stimulates aldosterone release from the adrenal cortex to increase sodium and water
retention.
QUESTION 4:
Aldosterone acts primarily on which part of the nephron?
A) Glomerulus
B) Proximal tubule
C) Distal convoluted tubule and collecting duct ✅
D) Loop of Henle
Rationale:
Aldosterone acts on the distal tubules and collecting ducts, promoting sodium reabsorption and
potassium excretion. This action increases water retention, supporting blood pressure and fluid
balance.
QUESTION 5:
What is the ultimate physiological outcome of RAAS activation?
A) Decreased blood pressure and increased urine output
B) Increased blood pressure and reduced urine volume ✅
C) Reduced aldosterone production
D) Increased heart rate with no effect on blood pressure
Rationale:
RAAS activation increases blood pressure through vasoconstriction and reduces urine output by
,conserving sodium and water via aldosterone. This maintains fluid balance and ensures adequate
perfusion during hypotension or hypovolemia.
Explain RAAS - ANSWER-Renin-angiotensin-aldosterone system
1. Reduce blood flow causes kidneys to release renin
> produce angiotensin I > converts angiotensin I to angiotensin II > vasoconstriction > release
aldosterone > kidneys conserve sodium and water > Result less water lost in urine and blood
pressure maintained.
DKA - ANSWER-increased anion gap, decreased HCO3
How do kidneys compensate for alkalosis - ANSWER-retain H and excrete HCO3
Untreated acidosis leads to an increase in which electrolyte? - ANSWER-Potassium
West Nile Virus - ANSWER-Transmitted through the bite of an infected mosquito. Severe signs
and symptoms; high fever, headache and stiff neck
Lyme disease - ANSWER-Tick-borne disease caused by the spirochete Borrelia burgdorferi.
Erythema infectiosum - ANSWER-a febrile upper respiratory illness in a child followed by the
sudden appearance of red, flushed cheeks, "fifth disease"
1
, Page 2 of 83
Obesity ad diabetes are risk factors for having a child with . - ANSWER-Spina bifida
Trousseau's sign - ANSWER-arm/carpal spasm associated with hypocalcemia
Cause and sign of spina bifida - ANSWER-results from failure of neural tube to close. sign - fluid
filled sac on lower back.
hemophilia is more common in - ANSWER-males
Prenatal exposure to alcohol includes - ANSWER-ND-PAE, decreased brain function, FAS
Connective vs muscle tissue disorders - ANSWER-Connective- RA, Scleroderma, Lupus
Muscle - MS, Muscular dystrophy, Myasthenia Gravia
Describe Lupus - ANSWER-Inflammatory disorder characterized by joint pain and butterfly rash
Describe Myasthenia Gravis - ANSWER-It is an autoimmune disorder where antibodies attack
own Ach receptors. This causes weakness of skeletal muscles over the course of the day, along
with ptosis, double vision, and difficulty swallowing.
Describe how your body responds to an infection. - ANSWER-T cells produce cytokines, which
stimulate B cells. B cells produce antibodies.
2
WGU D236 Pathophysiology Final Exam
Complete 300 Questions and Correct Detailed
Answers – Latest Update
Official Exam Overview:
The WGU D236 Final Exam evaluates learners’ mastery of pathophysiology concepts, including
systemic and cellular mechanisms of disease, homeostatic regulation, and clinical applications. The
exam emphasizes understanding organ system interactions, interpreting physiological data, and
explaining key compensatory processes.
Exam Coverage Areas:
• Renal, cardiovascular, and endocrine regulation
• Acid-base and electrolyte balance
• Immune, hematologic, and metabolic disorders
• Neurologic and musculoskeletal pathophysiology
• Homeostatic mechanisms and systemic compensatory responses
QUESTION 1:
Explain the Renin-Angiotensin-Aldosterone System (RAAS) and its role in blood pressure
regulation.
A) RAAS is a hormone system that decreases blood pressure
B) RAAS reduces blood flow by dilating vessels
C) RAAS regulates blood pressure and fluid balance ✅
D) RAAS primarily controls heart rate
Rationale:
RAAS is activated when renal perfusion decreases. Steps:
1. Kidneys release renin.
2. Renin converts angiotensinogen to angiotensin I.
3. ACE converts angiotensin I to angiotensin II.
4. Angiotensin II causes vasoconstriction and triggers aldosterone release.
5. Aldosterone promotes sodium and water retention, increasing blood volume.
Result: Blood pressure is maintained, and fluid balance is stabilized.
QUESTION 2:
Which organ primarily releases renin in the RAAS pathway?
,A) Liver
B) Adrenal glands
C) Kidneys ✅
D) Heart
Rationale:
The kidneys sense decreased perfusion or low sodium and release renin, which initiates the RAAS
cascade. The liver produces angiotensinogen, the adrenal glands release aldosterone, and the heart is
not the primary renin source.
QUESTION 3:
What is the main effect of angiotensin II on blood vessels?
A) Vasodilation
B) Vasoconstriction ✅
C) No effect
D) Decreased heart rate
Rationale:
Angiotensin II is a potent vasoconstrictor. It increases systemic vascular resistance, raising blood
pressure, and stimulates aldosterone release from the adrenal cortex to increase sodium and water
retention.
QUESTION 4:
Aldosterone acts primarily on which part of the nephron?
A) Glomerulus
B) Proximal tubule
C) Distal convoluted tubule and collecting duct ✅
D) Loop of Henle
Rationale:
Aldosterone acts on the distal tubules and collecting ducts, promoting sodium reabsorption and
potassium excretion. This action increases water retention, supporting blood pressure and fluid
balance.
QUESTION 5:
What is the ultimate physiological outcome of RAAS activation?
A) Decreased blood pressure and increased urine output
B) Increased blood pressure and reduced urine volume ✅
C) Reduced aldosterone production
D) Increased heart rate with no effect on blood pressure
Rationale:
RAAS activation increases blood pressure through vasoconstriction and reduces urine output by
,conserving sodium and water via aldosterone. This maintains fluid balance and ensures adequate
perfusion during hypotension or hypovolemia.
Explain RAAS - ANSWER-Renin-angiotensin-aldosterone system
1. Reduce blood flow causes kidneys to release renin
> produce angiotensin I > converts angiotensin I to angiotensin II > vasoconstriction > release
aldosterone > kidneys conserve sodium and water > Result less water lost in urine and blood
pressure maintained.
DKA - ANSWER-increased anion gap, decreased HCO3
How do kidneys compensate for alkalosis - ANSWER-retain H and excrete HCO3
Untreated acidosis leads to an increase in which electrolyte? - ANSWER-Potassium
West Nile Virus - ANSWER-Transmitted through the bite of an infected mosquito. Severe signs
and symptoms; high fever, headache and stiff neck
Lyme disease - ANSWER-Tick-borne disease caused by the spirochete Borrelia burgdorferi.
Erythema infectiosum - ANSWER-a febrile upper respiratory illness in a child followed by the
sudden appearance of red, flushed cheeks, "fifth disease"
1
, Page 2 of 83
Obesity ad diabetes are risk factors for having a child with . - ANSWER-Spina bifida
Trousseau's sign - ANSWER-arm/carpal spasm associated with hypocalcemia
Cause and sign of spina bifida - ANSWER-results from failure of neural tube to close. sign - fluid
filled sac on lower back.
hemophilia is more common in - ANSWER-males
Prenatal exposure to alcohol includes - ANSWER-ND-PAE, decreased brain function, FAS
Connective vs muscle tissue disorders - ANSWER-Connective- RA, Scleroderma, Lupus
Muscle - MS, Muscular dystrophy, Myasthenia Gravia
Describe Lupus - ANSWER-Inflammatory disorder characterized by joint pain and butterfly rash
Describe Myasthenia Gravis - ANSWER-It is an autoimmune disorder where antibodies attack
own Ach receptors. This causes weakness of skeletal muscles over the course of the day, along
with ptosis, double vision, and difficulty swallowing.
Describe how your body responds to an infection. - ANSWER-T cells produce cytokines, which
stimulate B cells. B cells produce antibodies.
2
