NUR 631/NUR631 Exam 3 V2 | Advanced
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient with chronic kidney disease (CKD) presents with anemia. What is the primary
cause of this condition in renal patients?
A. Chronic loss of blood in the urine
B. Destruction of red blood cells by uremic toxins
C. Iron deficiency due to poor dietary intake
D. Inadequate production of erythropoietin
Correct Answer: D
Expert Explanation: The kidneys are responsible for producing erythropoietin, which
stimulates the bone marrow to produce red blood cells. In chronic kidney disease, the
declining function of the nephrons leads to a significant decrease in this hormone’s
synthesis. Consequently, the patient develops a normochromic normocytic anemia that
typically requires exogenous erythropoietin replacement.
2. Which clinical manifestation is most characteristic of Graves’ disease?
A. Weight gain and bradycardia
B. Cold intolerance and dry skin
C. Exophthalmos and heat intolerance
,D. Hypotension and hyperkalemia
Correct Answer: C
Expert Explanation: Graves’ disease is an autoimmune disorder characterized by the
production of thyroid-stimulating immunoglobulins that lead to hyperthyroidism.
Exophthalmos occurs due to inflammation and accumulation of glycosaminoglycans in the
extraocular muscles and retro-orbital fat. Other symptoms like heat intolerance and
tachycardia result from the generalized increase in metabolic rate.
3. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
What laboratory finding should the nurse expect?
A. Dilute urine with low specific gravity
B. Serum osmolality of 310 mOsm/kg
C. Serum sodium of 120 mEq/L
D. Hypernatremia and dehydration
Correct Answer: C
Expert Explanation: SIADH involves the excessive release of ADH, which causes the
kidneys to reabsorb water back into the systemic circulation. This excess water results in
dilutional hyponatremia, often leading to serum sodium levels below 135 mEq/L. Patients
typically exhibit low serum osmolality and high urine osmolality because the urine is
concentrated.
, 4. What is the pathophysiological cause of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Excessive production of glucagon by alpha cells
C. Insulin resistance in peripheral tissues
D. Downregulation of insulin receptors
Correct Answer: A
Expert Explanation: Type 1 Diabetes Mellitus is primarily an autoimmune disease where
T-cells attack and destroy the insulin-producing beta cells in the Islets of Langerhans. This
leads to an absolute insulin deficiency, requiring the patient to depend on exogenous
insulin for survival. Unlike Type 2 Diabetes, it is not characterized by initial insulin
resistance or obesity-related receptor downregulation.
5. In the development of a peptic ulcer, what is the role of Helicobacter pylori?
A. It triggers an inflammatory response that damages the mucosal barrier
B. It produces urease which neutralizes stomach acid
C. It increases the production of protective mucus
D. It directly inhibits the secretion of gastrin
Correct Answer: A
Expert Explanation: H. pylori bacteria colonize the gastric mucosa and secrete enzymes
and toxins that degrade the protective mucus layer. This colonization triggers a chronic
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient with chronic kidney disease (CKD) presents with anemia. What is the primary
cause of this condition in renal patients?
A. Chronic loss of blood in the urine
B. Destruction of red blood cells by uremic toxins
C. Iron deficiency due to poor dietary intake
D. Inadequate production of erythropoietin
Correct Answer: D
Expert Explanation: The kidneys are responsible for producing erythropoietin, which
stimulates the bone marrow to produce red blood cells. In chronic kidney disease, the
declining function of the nephrons leads to a significant decrease in this hormone’s
synthesis. Consequently, the patient develops a normochromic normocytic anemia that
typically requires exogenous erythropoietin replacement.
2. Which clinical manifestation is most characteristic of Graves’ disease?
A. Weight gain and bradycardia
B. Cold intolerance and dry skin
C. Exophthalmos and heat intolerance
,D. Hypotension and hyperkalemia
Correct Answer: C
Expert Explanation: Graves’ disease is an autoimmune disorder characterized by the
production of thyroid-stimulating immunoglobulins that lead to hyperthyroidism.
Exophthalmos occurs due to inflammation and accumulation of glycosaminoglycans in the
extraocular muscles and retro-orbital fat. Other symptoms like heat intolerance and
tachycardia result from the generalized increase in metabolic rate.
3. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
What laboratory finding should the nurse expect?
A. Dilute urine with low specific gravity
B. Serum osmolality of 310 mOsm/kg
C. Serum sodium of 120 mEq/L
D. Hypernatremia and dehydration
Correct Answer: C
Expert Explanation: SIADH involves the excessive release of ADH, which causes the
kidneys to reabsorb water back into the systemic circulation. This excess water results in
dilutional hyponatremia, often leading to serum sodium levels below 135 mEq/L. Patients
typically exhibit low serum osmolality and high urine osmolality because the urine is
concentrated.
, 4. What is the pathophysiological cause of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Excessive production of glucagon by alpha cells
C. Insulin resistance in peripheral tissues
D. Downregulation of insulin receptors
Correct Answer: A
Expert Explanation: Type 1 Diabetes Mellitus is primarily an autoimmune disease where
T-cells attack and destroy the insulin-producing beta cells in the Islets of Langerhans. This
leads to an absolute insulin deficiency, requiring the patient to depend on exogenous
insulin for survival. Unlike Type 2 Diabetes, it is not characterized by initial insulin
resistance or obesity-related receptor downregulation.
5. In the development of a peptic ulcer, what is the role of Helicobacter pylori?
A. It triggers an inflammatory response that damages the mucosal barrier
B. It produces urease which neutralizes stomach acid
C. It increases the production of protective mucus
D. It directly inhibits the secretion of gastrin
Correct Answer: A
Expert Explanation: H. pylori bacteria colonize the gastric mucosa and secrete enzymes
and toxins that degrade the protective mucus layer. This colonization triggers a chronic
