D236 Pathophysiology Week 4 Study Guide: Endocrine and Renal
Systems 2026 |WGU
1. Which hormone is primarily responsible for the regulation of water balance
by the kidneys?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Insulin
D. Cortisol
Answer: B
Rationale: Antidiuretic hormone (ADH) regulates water reabsorption in the distal tubules
and collecting ducts of the kidney.
2. A patient presents with extreme thirst, polyuria, and a very low urine specific
gravity. Which condition is most likely?
A. Syndrome of Inappropriate ADH (SIADH)
B. Diabetes Insipidus
C. Diabetes Mellitus Type 2
D. Cushing’s Disease
Answer: B
Rationale: Diabetes Insipidus is characterized by a deficiency of ADH or a decreased renal
response to ADH, leading to large volumes of dilute urine.
,3. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), what electrolyte
imbalance is commonly observed?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Answer: C
Rationale: SIADH causes excessive water retention, which dilutes the blood and leads to
dilutional hyponatremia.
4. Which of the following is a primary cause of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Obesity and sedentary lifestyle
D. Overproduction of glucagon
Answer: B
Rationale: Type 1 Diabetes is an autoimmune condition where the immune system attacks
and destroys the insulin-producing beta cells in the pancreas.
5. What is the primary pathophysiology behind Type 2 Diabetes Mellitus?
A. Absolute insulin deficiency
B. Ketone body accumulation
C. Insulin resistance and relative insulin deficiency
D. Excessive secretion of somatostatin
Answer: C
Rationale: Type 2 Diabetes involves cells becoming resistant to insulin, paired with the
pancreas eventually failing to produce enough insulin to overcome this resistance.
, 6. A patient with Grave’s Disease is likely to exhibit which of the following
symptoms?
A. Weight gain and lethargy
B. Exophthalmos and tachycardia
C. Bradycardia and cold intolerance
D. Moon face and buffalo hump
Answer: B
Rationale: Grave’s Disease is a form of hyperthyroidism often characterized by bulging
eyes (exophthalmos), rapid heart rate, and heat intolerance.
7. Hashimoto’s Thyroiditis is the most common cause of which condition?
A. Hyperthyroidism
B. Hypothyroidism
C. Hypoparathyroidism
D. Pheochromocytoma
Answer: B
Rationale: Hashimoto’s is an autoimmune disorder where the immune system attacks the
thyroid gland, leading to chronic inflammation and hypothyroidism.
8. Which endocrine disorder is associated with the overproduction of cortisol?
A. Addison’s Disease
B. Cushing’s Syndrome
C. Conn’s Syndrome
D. Hashimoto’s Disease
Answer: B
Rationale: Cushing’s Syndrome is caused by prolonged exposure to high levels of cortisol,
whether from the body or external medications.
Systems 2026 |WGU
1. Which hormone is primarily responsible for the regulation of water balance
by the kidneys?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Insulin
D. Cortisol
Answer: B
Rationale: Antidiuretic hormone (ADH) regulates water reabsorption in the distal tubules
and collecting ducts of the kidney.
2. A patient presents with extreme thirst, polyuria, and a very low urine specific
gravity. Which condition is most likely?
A. Syndrome of Inappropriate ADH (SIADH)
B. Diabetes Insipidus
C. Diabetes Mellitus Type 2
D. Cushing’s Disease
Answer: B
Rationale: Diabetes Insipidus is characterized by a deficiency of ADH or a decreased renal
response to ADH, leading to large volumes of dilute urine.
,3. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), what electrolyte
imbalance is commonly observed?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Answer: C
Rationale: SIADH causes excessive water retention, which dilutes the blood and leads to
dilutional hyponatremia.
4. Which of the following is a primary cause of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Obesity and sedentary lifestyle
D. Overproduction of glucagon
Answer: B
Rationale: Type 1 Diabetes is an autoimmune condition where the immune system attacks
and destroys the insulin-producing beta cells in the pancreas.
5. What is the primary pathophysiology behind Type 2 Diabetes Mellitus?
A. Absolute insulin deficiency
B. Ketone body accumulation
C. Insulin resistance and relative insulin deficiency
D. Excessive secretion of somatostatin
Answer: C
Rationale: Type 2 Diabetes involves cells becoming resistant to insulin, paired with the
pancreas eventually failing to produce enough insulin to overcome this resistance.
, 6. A patient with Grave’s Disease is likely to exhibit which of the following
symptoms?
A. Weight gain and lethargy
B. Exophthalmos and tachycardia
C. Bradycardia and cold intolerance
D. Moon face and buffalo hump
Answer: B
Rationale: Grave’s Disease is a form of hyperthyroidism often characterized by bulging
eyes (exophthalmos), rapid heart rate, and heat intolerance.
7. Hashimoto’s Thyroiditis is the most common cause of which condition?
A. Hyperthyroidism
B. Hypothyroidism
C. Hypoparathyroidism
D. Pheochromocytoma
Answer: B
Rationale: Hashimoto’s is an autoimmune disorder where the immune system attacks the
thyroid gland, leading to chronic inflammation and hypothyroidism.
8. Which endocrine disorder is associated with the overproduction of cortisol?
A. Addison’s Disease
B. Cushing’s Syndrome
C. Conn’s Syndrome
D. Hashimoto’s Disease
Answer: B
Rationale: Cushing’s Syndrome is caused by prolonged exposure to high levels of cortisol,
whether from the body or external medications.
