NUR 631/NUR631 Exam 2 V3 | Advanced
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient presents with excessive thirst, a very high urine output of 10 liters per day, and a
low urine specific gravity. Which condition is most likely responsible for these symptoms?
A. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
B. Diabetes Insipidus (DI)
C. Diabetes Mellitus Type 2
D. Hyperaldosteronism
Answer: B
Rationale: Diabetes Insipidus is characterized by a deficiency of ADH or a decreased renal
response to ADH, leading to the excretion of large volumes of dilute urine. The lack of ADH
prevents the kidneys from reabsorbing water, resulting in polyuria and polydipsia. Urine
specific gravity in these patients is typically very low, often less than 1.005, due to the
inability to concentrate urine.
2. Which pathophysiological mechanism is the primary cause of Graves’ disease?
A. Thyroid-stimulating immunoglobulins (TSI) mimicking TSH
B. Thyroid hormone-secreting tumor
C. Autoimmune destruction of the thyroid gland
,D. Iodine deficiency leading to goiter
Answer: A
Rationale: Graves’ disease is an autoimmune disorder where the body produces antibodies
known as thyroid-stimulating immunoglobulins (TSI). These antibodies bind to the TSH
receptors on the thyroid gland, stimulating the continuous overproduction of thyroid
hormones. This leads to clinical hyperthyroidism, often accompanied by symptoms like
exophthalmos and a diffuse goiter.
3. A patient with a history of chronic corticosteroid use for rheumatoid arthritis suddenly
stops taking their medication. What is the most significant risk for this patient?
A. Cushing’s syndrome
B. Diabetes Mellitus
C. Thyroid storm
D. Secondary Adrenal Insufficiency
Answer: D
Rationale: Exogenous corticosteroid use suppresses the hypothalamic-pituitary-adrenal
(HPA) axis, leading to atrophy of the adrenal cortex. If the medication is stopped abruptly,
the adrenal glands cannot immediately resume adequate cortisol production. This results
in secondary adrenal insufficiency, which can escalate into a life-threatening adrenal crisis
if not managed properly.
, 4. In the development of Type 1 Diabetes Mellitus, which process is primarily responsible for
the destruction of pancreatic beta cells?
A. Insulin resistance in peripheral tissues
B. Amyloid deposition in the Islets of Langerhans
C. Chronic pancreatitis due to alcohol use
D. T-cell mediated autoimmune destruction
Answer: D
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
resulting from the autoimmune destruction of pancreatic beta cells. This process is
primarily mediated by T-lymphocytes that recognize beta cell antigens as foreign. By the
time clinical symptoms appear, approximately 80 to 90 percent of the beta cells have
typically been destroyed.
5. Which clinical finding is a hallmark of Nephrotic Syndrome, distinguishing it from Nephritic
Syndrome?
A. Gross hematuria and RBC casts
B. High levels of serum albumin
C. Hypertension and oliguria
D. Severe proteinuria exceeding 3.5 grams per day
Answer: D
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient presents with excessive thirst, a very high urine output of 10 liters per day, and a
low urine specific gravity. Which condition is most likely responsible for these symptoms?
A. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
B. Diabetes Insipidus (DI)
C. Diabetes Mellitus Type 2
D. Hyperaldosteronism
Answer: B
Rationale: Diabetes Insipidus is characterized by a deficiency of ADH or a decreased renal
response to ADH, leading to the excretion of large volumes of dilute urine. The lack of ADH
prevents the kidneys from reabsorbing water, resulting in polyuria and polydipsia. Urine
specific gravity in these patients is typically very low, often less than 1.005, due to the
inability to concentrate urine.
2. Which pathophysiological mechanism is the primary cause of Graves’ disease?
A. Thyroid-stimulating immunoglobulins (TSI) mimicking TSH
B. Thyroid hormone-secreting tumor
C. Autoimmune destruction of the thyroid gland
,D. Iodine deficiency leading to goiter
Answer: A
Rationale: Graves’ disease is an autoimmune disorder where the body produces antibodies
known as thyroid-stimulating immunoglobulins (TSI). These antibodies bind to the TSH
receptors on the thyroid gland, stimulating the continuous overproduction of thyroid
hormones. This leads to clinical hyperthyroidism, often accompanied by symptoms like
exophthalmos and a diffuse goiter.
3. A patient with a history of chronic corticosteroid use for rheumatoid arthritis suddenly
stops taking their medication. What is the most significant risk for this patient?
A. Cushing’s syndrome
B. Diabetes Mellitus
C. Thyroid storm
D. Secondary Adrenal Insufficiency
Answer: D
Rationale: Exogenous corticosteroid use suppresses the hypothalamic-pituitary-adrenal
(HPA) axis, leading to atrophy of the adrenal cortex. If the medication is stopped abruptly,
the adrenal glands cannot immediately resume adequate cortisol production. This results
in secondary adrenal insufficiency, which can escalate into a life-threatening adrenal crisis
if not managed properly.
, 4. In the development of Type 1 Diabetes Mellitus, which process is primarily responsible for
the destruction of pancreatic beta cells?
A. Insulin resistance in peripheral tissues
B. Amyloid deposition in the Islets of Langerhans
C. Chronic pancreatitis due to alcohol use
D. T-cell mediated autoimmune destruction
Answer: D
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
resulting from the autoimmune destruction of pancreatic beta cells. This process is
primarily mediated by T-lymphocytes that recognize beta cell antigens as foreign. By the
time clinical symptoms appear, approximately 80 to 90 percent of the beta cells have
typically been destroyed.
5. Which clinical finding is a hallmark of Nephrotic Syndrome, distinguishing it from Nephritic
Syndrome?
A. Gross hematuria and RBC casts
B. High levels of serum albumin
C. Hypertension and oliguria
D. Severe proteinuria exceeding 3.5 grams per day
Answer: D
