WGU D027
Advanced Pathopharmacological Foundations
Objective Assessment Final Exam—Questions with Answers
,1. What is the primary pathophysiologic defect in Type 1 diabetes mellitus?
A. Genetic resistance of muscle tissue to glucose uptake present since birth
B. Overproduction of glucagon by alpha cells with normal beta cell function
C. Excessive dietary carbohydrate intake overwhelming normal insulin
response
D. Autoimmune destruction of pancreatic beta cells leading to absolute insulin
deficiency.
Correct Answer: D. Autoimmune destruction of pancreatic beta cells leading
to absolute insulin deficiency.
Rationale: T-cell mediated autoimmune attack destroys beta cells in the islets
of Langerhans, so the body can no longer produce endogenous insulin,
requiring lifelong exogenous insulin replacement.
2. A patient with Type 2 diabetes has persistently elevated blood glucose
despite adequate insulin levels. What is the underlying mechanism?
A. Autoimmune destruction of pancreatic beta cells
B. Increased hepatic production of insulin-degrading enzyme
C. Insulin resistance at the cellular level combined with relative insulin
deficiency.
D. Primary defect in glucagon receptor signaling
Correct Answer: C. Insulin resistance at the cellular level combined with
relative insulin deficiency.
Rationale: In Type 2 diabetes, target tissues (muscle, fat, liver) become
resistant to insulin's effects, and over time beta cells cannot compensate,
producing hyperglycemia even when insulin is present.
3. What is the mechanism of action of metformin?
A. Stimulates pancreatic beta cells to release more insulin
B. Decreases hepatic glucose production and increases peripheral insulin
sensitivity.
C. Increases intestinal absorption of glucose
D. Blocks glucagon release from alpha cells
Correct Answer: B. Decreases hepatic glucose production and increases
peripheral insulin sensitivity.
, Rationale: Metformin suppresses gluconeogenesis in the liver and improves
glucose uptake in skeletal muscle without stimulating insulin secretion, so it
carries low hypoglycemia risk.
4. Why must metformin be held before procedures using iodinated contrast dye?
A. Risk of contrast-induced nephropathy leading to metformin accumulation
and lactic acidosis.
B. Risk of hypoglycemia from enhanced insulin secretion
C. Risk of hepatotoxicity from direct liver enzyme inhibition
D. Risk of allergic cross-reaction with the contrast dye itself
Correct Answer: A. Risk of contrast-induced nephropathy leading to
metformin accumulation and lactic acidosis.
Rationale: If renal function declines after contrast exposure, metformin can
accumulate and cause life-threatening lactic acidosis, so it is held 24-48 hours
before and after the procedure until renal function is confirmed stable.
5. What laboratory value best reflects average blood glucose control over the
preceding 2-3 months?
A. Fasting blood glucose
B. Random capillary glucose check
C. Urine glucose dipstick
D. Hemoglobin A1C.
Correct Answer: D. Hemoglobin A1C.
Rationale: A1C measures the percentage of hemoglobin that has become
glycosylated, which reflects average glucose exposure over the ~120-day
lifespan of red blood cells.
6. A patient presents with fruity breath odor, Kussmaul respirations, and blood
glucose of 450 mg/dL. What condition is suspected?
A. Hyperosmolar hyperglycemic state (HHS)
B. Hypoglycemic crisis
C. Diabetic ketoacidosis (DKA).
D. Acute pancreatitis
Correct Answer: C. Diabetic ketoacidosis (DKA).
Advanced Pathopharmacological Foundations
Objective Assessment Final Exam—Questions with Answers
,1. What is the primary pathophysiologic defect in Type 1 diabetes mellitus?
A. Genetic resistance of muscle tissue to glucose uptake present since birth
B. Overproduction of glucagon by alpha cells with normal beta cell function
C. Excessive dietary carbohydrate intake overwhelming normal insulin
response
D. Autoimmune destruction of pancreatic beta cells leading to absolute insulin
deficiency.
Correct Answer: D. Autoimmune destruction of pancreatic beta cells leading
to absolute insulin deficiency.
Rationale: T-cell mediated autoimmune attack destroys beta cells in the islets
of Langerhans, so the body can no longer produce endogenous insulin,
requiring lifelong exogenous insulin replacement.
2. A patient with Type 2 diabetes has persistently elevated blood glucose
despite adequate insulin levels. What is the underlying mechanism?
A. Autoimmune destruction of pancreatic beta cells
B. Increased hepatic production of insulin-degrading enzyme
C. Insulin resistance at the cellular level combined with relative insulin
deficiency.
D. Primary defect in glucagon receptor signaling
Correct Answer: C. Insulin resistance at the cellular level combined with
relative insulin deficiency.
Rationale: In Type 2 diabetes, target tissues (muscle, fat, liver) become
resistant to insulin's effects, and over time beta cells cannot compensate,
producing hyperglycemia even when insulin is present.
3. What is the mechanism of action of metformin?
A. Stimulates pancreatic beta cells to release more insulin
B. Decreases hepatic glucose production and increases peripheral insulin
sensitivity.
C. Increases intestinal absorption of glucose
D. Blocks glucagon release from alpha cells
Correct Answer: B. Decreases hepatic glucose production and increases
peripheral insulin sensitivity.
, Rationale: Metformin suppresses gluconeogenesis in the liver and improves
glucose uptake in skeletal muscle without stimulating insulin secretion, so it
carries low hypoglycemia risk.
4. Why must metformin be held before procedures using iodinated contrast dye?
A. Risk of contrast-induced nephropathy leading to metformin accumulation
and lactic acidosis.
B. Risk of hypoglycemia from enhanced insulin secretion
C. Risk of hepatotoxicity from direct liver enzyme inhibition
D. Risk of allergic cross-reaction with the contrast dye itself
Correct Answer: A. Risk of contrast-induced nephropathy leading to
metformin accumulation and lactic acidosis.
Rationale: If renal function declines after contrast exposure, metformin can
accumulate and cause life-threatening lactic acidosis, so it is held 24-48 hours
before and after the procedure until renal function is confirmed stable.
5. What laboratory value best reflects average blood glucose control over the
preceding 2-3 months?
A. Fasting blood glucose
B. Random capillary glucose check
C. Urine glucose dipstick
D. Hemoglobin A1C.
Correct Answer: D. Hemoglobin A1C.
Rationale: A1C measures the percentage of hemoglobin that has become
glycosylated, which reflects average glucose exposure over the ~120-day
lifespan of red blood cells.
6. A patient presents with fruity breath odor, Kussmaul respirations, and blood
glucose of 450 mg/dL. What condition is suspected?
A. Hyperosmolar hyperglycemic state (HHS)
B. Hypoglycemic crisis
C. Diabetic ketoacidosis (DKA).
D. Acute pancreatitis
Correct Answer: C. Diabetic ketoacidosis (DKA).
