NR 412 Exam 3: Pathophysiology V4 Updated and Latest
Questions and Correct Answers - Regis University
1. Which condition is characterized by an absolute deficiency of insulin due to autoimmune
destruction of pancreatic beta cells?
A. Type 2 Diabetes Mellitus
B. Gestational Diabetes
C. Metabolic Syndrome
D. Type 1 Diabetes Mellitus
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus involves the total loss of insulin production. This occurs when the
immune system attacks the beta cells in the pancreas. Choice A is incorrect because it involves insulin
resistance rather than absolute deficiency. Choice B refers to glucose intolerance during pregnancy
specifically. Choice D is a cluster of conditions increasing heart disease risk. Patients with Type 1 require
exogenous insulin to survive. The onset is usually sudden and occurs in younger populations. Clinical
signs include polyuria, polydipsia, and polyphagia. Autoantibodies are often present in the serum of these
patients. This condition can lead to diabetic ketoacidosis if untreated. Understanding this mechanism is
vital for managing patient care and education.
2. In Graves’ disease, what is the primary mechanism causing hyperthyroidism?
A. Thyroid-stimulating immunoglobulin (TSI) mimics TSH
B. Destruction of thyroid tissue by T-cells
C. Inadequate iodine intake in the diet
D. Pituitary gland failure to produce TSH
Correct Answer: A
Explanation: Graves’ disease is an autoimmune disorder where antibodies stimulate the thyroid. These
thyroid-stimulating immunoglobulins bind to TSH receptors. Choice B describes Hashimoto’s thyroiditis
which leads to hypothyroidism. Choice C causes goiters but usually results in lower thyroid hormone
levels. Choice D refers to secondary hypothyroidism rather than hyperthyroidism. The constant
stimulation leads to excessive secretion of T3 and T4. Patients often present with exophthalmos and heat
intolerance. TSH levels are typically very low due to negative feedback. Diagnosis is confirmed through
antibody testing and radioactive iodine uptake. It is the most common cause of hyperthyroidism
worldwide. Proper management involves antithyroid medications or radioactive iodine therapy.
,3. Which clinical manifestation is a hallmark of Cushing’s Syndrome?
A. Trunkal obesity and moon face
B. Hypotension and weight loss
C. Hyperpigmentation of the skin
D. High serum potassium levels
Correct Answer: A
Explanation: Cushing’s Syndrome results from chronic exposure to excessive cortisol. Trunkal obesity
and a rounded moon face are classic physical findings. Choice A is characteristic of Addison’s disease or
adrenal insufficiency. Choice C is also a specific sign found in Addison’s disease due to ACTH excess.
Choice D is incorrect because cortisol excess usually causes hypokalemia. Patients may also exhibit a
buffalo hump and thin skin. Hypertension is a frequent complication due to mineralocorticoid effects.
Striae or purple stretch marks often appear on the abdomen. High glucose levels are common because
cortisol stimulates gluconeogenesis. This condition requires careful diagnostic testing of cortisol levels.
Nurses must monitor for signs of infection and bone fractures.
4. What is the pathophysiological cause of Diabetes Insipidus?
A. Excessive secretion of Antidiuretic Hormone
B. Autoimmune destruction of the adrenal cortex
C. Deficiency of Antidiuretic Hormone or decreased renal response
D. Excessive production of aldosterone by the adrenals
Correct Answer: C
Explanation: Diabetes Insipidus involves a lack of ADH effect on the kidneys. This leads to the excretion
of large volumes of dilute urine. Choice A describes SIADH which causes water retention. Choice C refers
to Addison’s disease which affects cortisol and aldosterone. Choice D describes Conn’s syndrome which
leads to hypertension and low potassium. Without ADH, the collecting ducts remain impermeable to
water. Patients experience extreme thirst and frequent urination. Serum osmolality increases while urine
osmolality remains very low. The condition can be central or nephrogenic in origin. Treatment often
involves the administration of synthetic ADH like desmopressin. Monitoring fluid balance is the highest
priority for these patients.
, 5. A patient with SIADH is likely to exhibit which of the following laboratory findings?
A. Hypernatremia and low urine osmolality
B. Hyperglycemia and ketonuria
C. Hyponatremia and high urine osmolality
D. Hypocalcemia and high serum phosphorus
Correct Answer: C
Explanation: SIADH involves the excessive release of antidiuretic hormone. This causes the body to
retain too much water regardless of intake. Choice A describes the findings for Diabetes Insipidus. Choice
C is associated with diabetic ketoacidosis. Choice D relates to hypoparathyroidism. In SIADH, the blood
becomes diluted, leading to hyponatremia. The urine becomes concentrated because water is not being
excreted. This can lead to cerebral edema and seizures if severe. Management includes fluid restriction
and treating the underlying cause. Medications like diuretics may be used in certain cases. Nurses must
monitor neurological status and serum sodium levels closely.
6. What is the primary pathology in Multiple Sclerosis (MS)?
A. Depletion of dopamine in the basal ganglia
B. Accumulation of amyloid plaques in the brain
C. Demyelination of central nervous system neurons
D. Degeneration of lower motor neurons in the spinal cord
Correct Answer: C
Explanation: Multiple Sclerosis is an autoimmune disease affecting the CNS. It is characterized by the
destruction of the myelin sheath. Choice A describes the mechanism behind Parkinson’s disease. Choice C
is the hallmark of Alzheimer’s disease pathology. Choice D is characteristic of Amyotrophic Lateral
Sclerosis. Loss of myelin slows or blocks nerve impulse conduction. This results in various motor,
sensory, and cognitive symptoms. The disease often presents with periods of relapse and remission.
Sclerotic plaques form in the white matter of the brain and cord. Diagnosis is supported by MRI findings
and CSF analysis. Management focuses on slowing disease progression and managing symptoms. Early
intervention is key to maintaining functional independence.
Questions and Correct Answers - Regis University
1. Which condition is characterized by an absolute deficiency of insulin due to autoimmune
destruction of pancreatic beta cells?
A. Type 2 Diabetes Mellitus
B. Gestational Diabetes
C. Metabolic Syndrome
D. Type 1 Diabetes Mellitus
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus involves the total loss of insulin production. This occurs when the
immune system attacks the beta cells in the pancreas. Choice A is incorrect because it involves insulin
resistance rather than absolute deficiency. Choice B refers to glucose intolerance during pregnancy
specifically. Choice D is a cluster of conditions increasing heart disease risk. Patients with Type 1 require
exogenous insulin to survive. The onset is usually sudden and occurs in younger populations. Clinical
signs include polyuria, polydipsia, and polyphagia. Autoantibodies are often present in the serum of these
patients. This condition can lead to diabetic ketoacidosis if untreated. Understanding this mechanism is
vital for managing patient care and education.
2. In Graves’ disease, what is the primary mechanism causing hyperthyroidism?
A. Thyroid-stimulating immunoglobulin (TSI) mimics TSH
B. Destruction of thyroid tissue by T-cells
C. Inadequate iodine intake in the diet
D. Pituitary gland failure to produce TSH
Correct Answer: A
Explanation: Graves’ disease is an autoimmune disorder where antibodies stimulate the thyroid. These
thyroid-stimulating immunoglobulins bind to TSH receptors. Choice B describes Hashimoto’s thyroiditis
which leads to hypothyroidism. Choice C causes goiters but usually results in lower thyroid hormone
levels. Choice D refers to secondary hypothyroidism rather than hyperthyroidism. The constant
stimulation leads to excessive secretion of T3 and T4. Patients often present with exophthalmos and heat
intolerance. TSH levels are typically very low due to negative feedback. Diagnosis is confirmed through
antibody testing and radioactive iodine uptake. It is the most common cause of hyperthyroidism
worldwide. Proper management involves antithyroid medications or radioactive iodine therapy.
,3. Which clinical manifestation is a hallmark of Cushing’s Syndrome?
A. Trunkal obesity and moon face
B. Hypotension and weight loss
C. Hyperpigmentation of the skin
D. High serum potassium levels
Correct Answer: A
Explanation: Cushing’s Syndrome results from chronic exposure to excessive cortisol. Trunkal obesity
and a rounded moon face are classic physical findings. Choice A is characteristic of Addison’s disease or
adrenal insufficiency. Choice C is also a specific sign found in Addison’s disease due to ACTH excess.
Choice D is incorrect because cortisol excess usually causes hypokalemia. Patients may also exhibit a
buffalo hump and thin skin. Hypertension is a frequent complication due to mineralocorticoid effects.
Striae or purple stretch marks often appear on the abdomen. High glucose levels are common because
cortisol stimulates gluconeogenesis. This condition requires careful diagnostic testing of cortisol levels.
Nurses must monitor for signs of infection and bone fractures.
4. What is the pathophysiological cause of Diabetes Insipidus?
A. Excessive secretion of Antidiuretic Hormone
B. Autoimmune destruction of the adrenal cortex
C. Deficiency of Antidiuretic Hormone or decreased renal response
D. Excessive production of aldosterone by the adrenals
Correct Answer: C
Explanation: Diabetes Insipidus involves a lack of ADH effect on the kidneys. This leads to the excretion
of large volumes of dilute urine. Choice A describes SIADH which causes water retention. Choice C refers
to Addison’s disease which affects cortisol and aldosterone. Choice D describes Conn’s syndrome which
leads to hypertension and low potassium. Without ADH, the collecting ducts remain impermeable to
water. Patients experience extreme thirst and frequent urination. Serum osmolality increases while urine
osmolality remains very low. The condition can be central or nephrogenic in origin. Treatment often
involves the administration of synthetic ADH like desmopressin. Monitoring fluid balance is the highest
priority for these patients.
, 5. A patient with SIADH is likely to exhibit which of the following laboratory findings?
A. Hypernatremia and low urine osmolality
B. Hyperglycemia and ketonuria
C. Hyponatremia and high urine osmolality
D. Hypocalcemia and high serum phosphorus
Correct Answer: C
Explanation: SIADH involves the excessive release of antidiuretic hormone. This causes the body to
retain too much water regardless of intake. Choice A describes the findings for Diabetes Insipidus. Choice
C is associated with diabetic ketoacidosis. Choice D relates to hypoparathyroidism. In SIADH, the blood
becomes diluted, leading to hyponatremia. The urine becomes concentrated because water is not being
excreted. This can lead to cerebral edema and seizures if severe. Management includes fluid restriction
and treating the underlying cause. Medications like diuretics may be used in certain cases. Nurses must
monitor neurological status and serum sodium levels closely.
6. What is the primary pathology in Multiple Sclerosis (MS)?
A. Depletion of dopamine in the basal ganglia
B. Accumulation of amyloid plaques in the brain
C. Demyelination of central nervous system neurons
D. Degeneration of lower motor neurons in the spinal cord
Correct Answer: C
Explanation: Multiple Sclerosis is an autoimmune disease affecting the CNS. It is characterized by the
destruction of the myelin sheath. Choice A describes the mechanism behind Parkinson’s disease. Choice C
is the hallmark of Alzheimer’s disease pathology. Choice D is characteristic of Amyotrophic Lateral
Sclerosis. Loss of myelin slows or blocks nerve impulse conduction. This results in various motor,
sensory, and cognitive symptoms. The disease often presents with periods of relapse and remission.
Sclerotic plaques form in the white matter of the brain and cord. Diagnosis is supported by MRI findings
and CSF analysis. Management focuses on slowing disease progression and managing symptoms. Early
intervention is key to maintaining functional independence.
