NR 412 Exam 3: Pathophysiology V3 Updated and Latest
Questions and Correct Answers - Regis University
1. Which pathophysiological mechanism best describes Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Decreased glucose absorption in the GI tract
C. Excessive glucagon production by alpha cells
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus is an autoimmune disorder. The immune system attacks the
pancreatic beta cells. This results in an absolute insulin deficiency. Without insulin, glucose cannot enter
the cells. Hyperglycemia develops rapidly in these patients. It is often diagnosed in childhood or
adolescence. Patients require exogenous insulin for survival. This differs from Type 2 which involves
resistance. Genetic and environmental factors play a role. The answer reflects the primary destructive
mechanism.
2. A patient with Grave’s disease is likely to exhibit which of the following symptoms?
A. Bradycardia and weight gain
B. Hypotension and dry skin
C. Cold intolerance and lethargy
D. Exophthalmos and tachycardia
Correct Answer: D
Explanation: Grave’s disease is a form of hyperthyroidism. It involves Type II hypersensitivity where
antibodies stimulate TSH receptors. This causes excessive secretion of thyroid hormones. Tachycardia is
a common cardiovascular manifestation. Exophthalmos results from inflammation of extraocular
muscles. Patients often feel heat intolerance and anxiety. Metabolism is significantly increased in this
state. Weight loss occurs despite increased appetite. Thyroid storm is a potential severe complication.
The selected symptoms are classic indicators of this condition.
,3. What is the primary cause of the clinical manifestations seen in Cushing’s Syndrome?
A. Deficiency of cortisol
B. Excessive secretion of cortisol
C. Low levels of aldosterone
D. Overproduction of insulin
Correct Answer: B
Explanation: Cushing’s Syndrome results from chronic exposure to excess cortisol. It can be endogenous
or exogenous. Cortisol affects protein and fat metabolism. This leads to the classic moon face appearance.
A buffalo hump is another common physical sign. Hyperglycemia is often present due to gluconeogenesis.
Skin becomes thin and bruises easily. Hypertension is frequently observed in these patients. It must be
distinguished from Cushing’s Disease. The answer identifies the hormone responsible for the pathology.
4. Which electrolyte imbalance is most commonly associated with Addison’s Disease?
A. Hypernatremia and hypokalemia
B. Hyponatremia and hyperkalemia
C. Hypocalcemia and hypermagnesemia
D. Hypernatremia and hypercalcemia
Correct Answer: B
Explanation: Addison’s Disease involves primary adrenal insufficiency. There is a lack of cortisol and
aldosterone. Aldosterone normally promotes sodium retention and potassium excretion. Without it, the
kidneys waste sodium. This leads to hyponatremia in the blood. Simultaneously, potassium is retained
leading to hyperkalemia. Patients may experience severe hypotension and fatigue. Skin
hyperpigmentation is a hallmark physical finding. This condition requires lifelong hormone replacement
therapy. The electrolyte pattern is a key diagnostic clue.
5. In Diabetes Insipidus, what is the underlying deficiency?
A. Insulin
B. Aldosterone
C. Antidiuretic hormone (ADH)
D. Growth hormone
Correct Answer: C
Explanation: Diabetes Insipidus is characterized by polyuria and polydipsia. It involves a deficiency or
resistance to ADH. ADH normally acts on the renal tubules. It promotes water reabsorption into the
blood. Without ADH, the kidneys produce dilute urine. This leads to severe dehydration if untreated.
, Plasma osmolality increases while urine osmolality decreases. It can be central or nephrogenic. Patients
often have a craving for cold water. The lack of ADH is the central issue.
6. Which condition is characterized by the excessive secretion of ADH despite normal water
balance?
A. Diabetes Insipidus
B. Hashimoto’s disease
C. Hypoparathyroidism
D. SIADH
Correct Answer: D
Explanation: SIADH involves the inappropriate release of ADH. This leads to excessive water retention.
The body experiences dilutional hyponatremia as a result. Fluid volume expands without causing
peripheral edema. Urine becomes highly concentrated despite fluid intake. It is often caused by ectopic
tumors. Central nervous system disorders can also trigger it. Patients may experience confusion or
seizures. Treatment involves strict fluid restriction and monitoring. SIADH is the opposite of Diabetes
Insipidus.
7. A patient with Chronic Kidney Disease (CKD) often develops anemia because:
A. The kidneys fail to produce erythropoietin
B. Iron is lost in the urine
C. White blood cells destroy red blood cells
D. The patient is constantly bleeding
Correct Answer: A
Explanation: The kidneys play a vital role in hematopoiesis. They produce the hormone known as
erythropoietin. Erythropoietin stimulates the bone marrow to make RBCs. In CKD, the renal tissue is
damaged. This leads to a significant decrease in hormone production. Consequently, red blood cell counts
drop significantly. This results in normocytic and normochromic anemia. Patients often experience
profound fatigue and weakness. Synthetic erythropoietin is often used for treatment. This explains the
renal-anemia connection in pathology.
Questions and Correct Answers - Regis University
1. Which pathophysiological mechanism best describes Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Decreased glucose absorption in the GI tract
C. Excessive glucagon production by alpha cells
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus is an autoimmune disorder. The immune system attacks the
pancreatic beta cells. This results in an absolute insulin deficiency. Without insulin, glucose cannot enter
the cells. Hyperglycemia develops rapidly in these patients. It is often diagnosed in childhood or
adolescence. Patients require exogenous insulin for survival. This differs from Type 2 which involves
resistance. Genetic and environmental factors play a role. The answer reflects the primary destructive
mechanism.
2. A patient with Grave’s disease is likely to exhibit which of the following symptoms?
A. Bradycardia and weight gain
B. Hypotension and dry skin
C. Cold intolerance and lethargy
D. Exophthalmos and tachycardia
Correct Answer: D
Explanation: Grave’s disease is a form of hyperthyroidism. It involves Type II hypersensitivity where
antibodies stimulate TSH receptors. This causes excessive secretion of thyroid hormones. Tachycardia is
a common cardiovascular manifestation. Exophthalmos results from inflammation of extraocular
muscles. Patients often feel heat intolerance and anxiety. Metabolism is significantly increased in this
state. Weight loss occurs despite increased appetite. Thyroid storm is a potential severe complication.
The selected symptoms are classic indicators of this condition.
,3. What is the primary cause of the clinical manifestations seen in Cushing’s Syndrome?
A. Deficiency of cortisol
B. Excessive secretion of cortisol
C. Low levels of aldosterone
D. Overproduction of insulin
Correct Answer: B
Explanation: Cushing’s Syndrome results from chronic exposure to excess cortisol. It can be endogenous
or exogenous. Cortisol affects protein and fat metabolism. This leads to the classic moon face appearance.
A buffalo hump is another common physical sign. Hyperglycemia is often present due to gluconeogenesis.
Skin becomes thin and bruises easily. Hypertension is frequently observed in these patients. It must be
distinguished from Cushing’s Disease. The answer identifies the hormone responsible for the pathology.
4. Which electrolyte imbalance is most commonly associated with Addison’s Disease?
A. Hypernatremia and hypokalemia
B. Hyponatremia and hyperkalemia
C. Hypocalcemia and hypermagnesemia
D. Hypernatremia and hypercalcemia
Correct Answer: B
Explanation: Addison’s Disease involves primary adrenal insufficiency. There is a lack of cortisol and
aldosterone. Aldosterone normally promotes sodium retention and potassium excretion. Without it, the
kidneys waste sodium. This leads to hyponatremia in the blood. Simultaneously, potassium is retained
leading to hyperkalemia. Patients may experience severe hypotension and fatigue. Skin
hyperpigmentation is a hallmark physical finding. This condition requires lifelong hormone replacement
therapy. The electrolyte pattern is a key diagnostic clue.
5. In Diabetes Insipidus, what is the underlying deficiency?
A. Insulin
B. Aldosterone
C. Antidiuretic hormone (ADH)
D. Growth hormone
Correct Answer: C
Explanation: Diabetes Insipidus is characterized by polyuria and polydipsia. It involves a deficiency or
resistance to ADH. ADH normally acts on the renal tubules. It promotes water reabsorption into the
blood. Without ADH, the kidneys produce dilute urine. This leads to severe dehydration if untreated.
, Plasma osmolality increases while urine osmolality decreases. It can be central or nephrogenic. Patients
often have a craving for cold water. The lack of ADH is the central issue.
6. Which condition is characterized by the excessive secretion of ADH despite normal water
balance?
A. Diabetes Insipidus
B. Hashimoto’s disease
C. Hypoparathyroidism
D. SIADH
Correct Answer: D
Explanation: SIADH involves the inappropriate release of ADH. This leads to excessive water retention.
The body experiences dilutional hyponatremia as a result. Fluid volume expands without causing
peripheral edema. Urine becomes highly concentrated despite fluid intake. It is often caused by ectopic
tumors. Central nervous system disorders can also trigger it. Patients may experience confusion or
seizures. Treatment involves strict fluid restriction and monitoring. SIADH is the opposite of Diabetes
Insipidus.
7. A patient with Chronic Kidney Disease (CKD) often develops anemia because:
A. The kidneys fail to produce erythropoietin
B. Iron is lost in the urine
C. White blood cells destroy red blood cells
D. The patient is constantly bleeding
Correct Answer: A
Explanation: The kidneys play a vital role in hematopoiesis. They produce the hormone known as
erythropoietin. Erythropoietin stimulates the bone marrow to make RBCs. In CKD, the renal tissue is
damaged. This leads to a significant decrease in hormone production. Consequently, red blood cell counts
drop significantly. This results in normocytic and normochromic anemia. Patients often experience
profound fatigue and weakness. Synthetic erythropoietin is often used for treatment. This explains the
renal-anemia connection in pathology.
