WGU D115 Advanced Pathophysiology for APN
COMPREHENSIVE OBJECTIVE ASSESSMENT (OA)
PRACTICE EXAM QUESTIONS WITH VERIFIED
ANSWERS AND RATIONALES 2025/2026 EDITION |
INSTANT PDF DOWNLOAD
1. Which pathophysiologic mechanism is primarily responsible for Type 1
Diabetes Mellitus?
A. Insulin resistance
B. Obesity-induced hyperglycemia
C. Autoimmune destruction of pancreatic beta cells
D. Chronic pancreatitis
ANSWER: C
Rationale: Type 1 Diabetes is caused by T-cell-mediated autoimmune destruction
of insulin-producing pancreatic beta cells, leading to absolute insulin deficiency.
2. Which physiologic change is characteristic of left-sided heart failure?
A. Peripheral edema
B. Pulmonary congestion and dyspnea
C. Pulmonary hypertension
D. Right ventricular hypertrophy
ANSWER: B
Rationale: Left-sided heart failure causes blood to back up into the pulmonary
circulation, resulting in pulmonary congestion and dyspnea.
3. In asthma, which cell type primarily mediates airway inflammatory
responses?
A. Neutrophils
B. Eosinophils
,C. Basophils
D. Monocytes
ANSWER: B
Rationale: Eosinophils release inflammatory mediators that cause airway
hyperresponsiveness and remodeling in asthma.
4. Which electrolyte imbalance is most likely in diabetic ketoacidosis (DKA)?
A. Hypernatremia
B. Hyperkalemia
C. Hypocalcemia
D. Hypomagnesemia
ANSWER: B
Rationale: Insulin deficiency and acidosis shift potassium from cells to
extracellular fluid, causing hyperkalemia despite total body potassium depletion.
5. What is the hallmark laboratory finding in iron-deficiency anemia?
A. Macrocytosis
B. Microcytosis with low ferritin
C. Pancytopenia
D. Reticulocytosis
ANSWER: B
Rationale: Iron-deficiency anemia presents with small (microcytic), hypochromic
red blood cells and low serum ferritin, indicating depleted iron stores.
6. In cellular injury, what process describes programmed cell death?
A. Necrosis
B. Apoptosis
C. Autophagy
D. Metaplasia
ANSWER: B
,Rationale: Apoptosis is a regulated, energy-dependent process of programmed cell
death that occurs in response to various physiological and pathological stimuli.
7. Which of the following is an example of reversible cellular injury?
A. Apoptosis
B. Cellular swelling (hydropic change)
C. Coagulative necrosis
D. Liquefactive necrosis
ANSWER: B
Rationale: Cellular swelling (hydropic change) is a reversible cellular injury
characterized by accumulation of intracellular water due to failure of the sodium-
potassium pump.
8. What is the primary mechanism of injury in ischemic cell death?
A. Direct physical trauma
B. Reduced oxygen delivery to cells
C. Excessive free radical formation
D. Genetic mutations
ANSWER: B
Rationale: Ischemic cell death occurs when blood flow is reduced, decreasing
oxygen delivery to tissues. This leads to mitochondrial dysfunction, ATP
depletion, and cell death.
9. Which of the following describes "metaplasia"?
A. Replacement of one differentiated cell type with another
B. Increased cell size in response to a stimulus
C. Disorganized growth of cells
D. Decreased cell size
ANSWER: A
, Rationale: Metaplasia is the reversible replacement of one differentiated cell type
with another in response to chronic irritation or stress.
10. What is a characteristic of malignant (cancer) cells?
A. Well-differentiated
B. Organized growth
C. Anaplasia and metastasis
D. Non-invasive
ANSWER: C
Rationale: Malignant cells exhibit anaplasia (loss of differentiation) and have the
ability to invade surrounding tissues and metastasize to distant sites.
11. What is the primary cause of cellular aging?
A. Increased cellular metabolism
B. Telomere shortening and oxidative stress
C. Excessive cellular division
D. Decreased protein synthesis
ANSWER: B
Rationale: Cellular aging (senescence) is caused by telomere shortening with each
cell division and accumulation of oxidative damage over time.
12. In apoptosis, which of the following occurs?
A. Cellular swelling and rupture
B. Cellular shrinkage and fragmentation
C. Inflammation and necrosis
D. Cellular enlargement
ANSWER: B
Rationale: Apoptosis is characterized by cellular shrinkage, condensation of
chromatin, and fragmentation into apoptotic bodies that are phagocytosed without
inflammation.
COMPREHENSIVE OBJECTIVE ASSESSMENT (OA)
PRACTICE EXAM QUESTIONS WITH VERIFIED
ANSWERS AND RATIONALES 2025/2026 EDITION |
INSTANT PDF DOWNLOAD
1. Which pathophysiologic mechanism is primarily responsible for Type 1
Diabetes Mellitus?
A. Insulin resistance
B. Obesity-induced hyperglycemia
C. Autoimmune destruction of pancreatic beta cells
D. Chronic pancreatitis
ANSWER: C
Rationale: Type 1 Diabetes is caused by T-cell-mediated autoimmune destruction
of insulin-producing pancreatic beta cells, leading to absolute insulin deficiency.
2. Which physiologic change is characteristic of left-sided heart failure?
A. Peripheral edema
B. Pulmonary congestion and dyspnea
C. Pulmonary hypertension
D. Right ventricular hypertrophy
ANSWER: B
Rationale: Left-sided heart failure causes blood to back up into the pulmonary
circulation, resulting in pulmonary congestion and dyspnea.
3. In asthma, which cell type primarily mediates airway inflammatory
responses?
A. Neutrophils
B. Eosinophils
,C. Basophils
D. Monocytes
ANSWER: B
Rationale: Eosinophils release inflammatory mediators that cause airway
hyperresponsiveness and remodeling in asthma.
4. Which electrolyte imbalance is most likely in diabetic ketoacidosis (DKA)?
A. Hypernatremia
B. Hyperkalemia
C. Hypocalcemia
D. Hypomagnesemia
ANSWER: B
Rationale: Insulin deficiency and acidosis shift potassium from cells to
extracellular fluid, causing hyperkalemia despite total body potassium depletion.
5. What is the hallmark laboratory finding in iron-deficiency anemia?
A. Macrocytosis
B. Microcytosis with low ferritin
C. Pancytopenia
D. Reticulocytosis
ANSWER: B
Rationale: Iron-deficiency anemia presents with small (microcytic), hypochromic
red blood cells and low serum ferritin, indicating depleted iron stores.
6. In cellular injury, what process describes programmed cell death?
A. Necrosis
B. Apoptosis
C. Autophagy
D. Metaplasia
ANSWER: B
,Rationale: Apoptosis is a regulated, energy-dependent process of programmed cell
death that occurs in response to various physiological and pathological stimuli.
7. Which of the following is an example of reversible cellular injury?
A. Apoptosis
B. Cellular swelling (hydropic change)
C. Coagulative necrosis
D. Liquefactive necrosis
ANSWER: B
Rationale: Cellular swelling (hydropic change) is a reversible cellular injury
characterized by accumulation of intracellular water due to failure of the sodium-
potassium pump.
8. What is the primary mechanism of injury in ischemic cell death?
A. Direct physical trauma
B. Reduced oxygen delivery to cells
C. Excessive free radical formation
D. Genetic mutations
ANSWER: B
Rationale: Ischemic cell death occurs when blood flow is reduced, decreasing
oxygen delivery to tissues. This leads to mitochondrial dysfunction, ATP
depletion, and cell death.
9. Which of the following describes "metaplasia"?
A. Replacement of one differentiated cell type with another
B. Increased cell size in response to a stimulus
C. Disorganized growth of cells
D. Decreased cell size
ANSWER: A
, Rationale: Metaplasia is the reversible replacement of one differentiated cell type
with another in response to chronic irritation or stress.
10. What is a characteristic of malignant (cancer) cells?
A. Well-differentiated
B. Organized growth
C. Anaplasia and metastasis
D. Non-invasive
ANSWER: C
Rationale: Malignant cells exhibit anaplasia (loss of differentiation) and have the
ability to invade surrounding tissues and metastasize to distant sites.
11. What is the primary cause of cellular aging?
A. Increased cellular metabolism
B. Telomere shortening and oxidative stress
C. Excessive cellular division
D. Decreased protein synthesis
ANSWER: B
Rationale: Cellular aging (senescence) is caused by telomere shortening with each
cell division and accumulation of oxidative damage over time.
12. In apoptosis, which of the following occurs?
A. Cellular swelling and rupture
B. Cellular shrinkage and fragmentation
C. Inflammation and necrosis
D. Cellular enlargement
ANSWER: B
Rationale: Apoptosis is characterized by cellular shrinkage, condensation of
chromatin, and fragmentation into apoptotic bodies that are phagocytosed without
inflammation.
