NR-283 Exam 3: Pathophysiology V1 Updated and Latest
Questions and Correct Answers with Rationale -
Chamberlain 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. Diabetes Insipidus
C. Type 1 Diabetes Mellitus
D. Gestational Diabetes
Ans: C
Rationale: Type 1 diabetes mellitus involves the immune system attacking and destroying the insulin-
producing cells in the pancreas. This leads to a total lack of endogenous insulin production which
requires external administration for survival. Genetic factors and environmental triggers are often
implicated in the onset of this chronic condition. Patients typically present with symptoms such as
polyuria, polydipsia, and significant weight loss. Unlike Type 2, this is not primarily driven by lifestyle
factors or insulin resistance initially. It is most commonly diagnosed in children and young adults
although it can occur later.
,2. A patient presents with extreme hyperglycemia, dehydration, and a lack of ketones in the
urine. Which condition is most likely?
A. Diabetic Ketoacidosis
B. Hypoglycemic Unawareness
C. Hyperosmolar Hyperglycemic State
D. Metabolic Syndrome
Ans: C
Rationale: Hyperosmolar Hyperglycemic State or HHS is a serious complication primarily seen in Type 2
diabetes. It is characterized by extremely high blood glucose levels often exceeding 600 mg/dL. Because
some insulin is still present, the body avoids the breakdown of fats and subsequent ketone production.
This lack of ketosis distinguishes it clearly from the more acidic state of diabetic ketoacidosis. Severe
dehydration occurs due to osmotic diuresis caused by the high glucose concentration in the blood.
Treatment focuses heavily on aggressive fluid replacement and careful insulin administration to lower
blood sugar.
3. Which clinical manifestation is a hallmark sign of Grave’s disease?
A. Bradycardia
B. Cold intolerance
C. Weight gain
D. Exophthalmos
Ans: D
,Rationale: Grave’s disease is an autoimmune disorder that results in the overproduction of thyroid
hormones. Exophthalmos is a specific condition where the eyes bulge forward due to inflammation in the
orbital tissues. This occurs because the antibodies attacking the thyroid also affect the tissues behind the
eyes. Other symptoms include tachycardia, heat intolerance, and unintended weight loss despite an
increased appetite. The underlying cause is the production of thyroid-stimulating immunoglobulins that
mimic TSH. Managing this condition often involves medications to block hormone production or
radioactive iodine therapy.
4. What is the primary pathophysiology behind Multiple Sclerosis (MS)?
A. Loss of dopamine-producing neurons
B. Demyelination of central nervous system neurons
C. Destruction of acetylcholine receptors
D. Accumulation of beta-amyloid plaques
Ans: B
Rationale: Multiple Sclerosis is a chronic autoimmune disease that targets the protective myelin sheath
of the CNS. When the myelin is damaged, the transmission of nerve impulses is slowed or completely
blocked. This leads to a variety of neurological symptoms including muscle weakness, vision loss, and
coordination issues. The disease is characterized by periods of exacerbation and remission as the body
attempts to repair damage. Over time, permanent scarring or plaques form on the affected nerve fibers
within the brain and spinal cord. Diagnosis is usually supported by MRI findings showing these specific
lesions in multiple locations.
, 5. Which hormone deficiency is responsible for the development of Diabetes Insipidus?
A. Insulin
B. Antidiuretic Hormone
C. Aldosterone
D. Cortisol
Ans: B
Rationale: Diabetes Insipidus is caused by a deficiency or a decreased response to Antidiuretic Hormone
or ADH. ADH is normally produced by the hypothalamus and stored in the posterior pituitary gland to
regulate water. Without enough ADH, the kidneys are unable to reabsorb water, leading to massive
amounts of dilute urine. Patients experience extreme thirst and are at a high risk for severe dehydration
and electrolyte imbalances. This condition is separate from diabetes mellitus as it does not involve
glucose or insulin metabolism. Treatment typically involves administering a synthetic form of ADH
known as desmopressin.
6. Cushing’s Syndrome is caused by an excess of which hormone?
A. Cortisol
B. Growth Hormone
C. Thyroxine
D. Epinephrine
Ans: A
Questions and Correct Answers with Rationale -
Chamberlain 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. Diabetes Insipidus
C. Type 1 Diabetes Mellitus
D. Gestational Diabetes
Ans: C
Rationale: Type 1 diabetes mellitus involves the immune system attacking and destroying the insulin-
producing cells in the pancreas. This leads to a total lack of endogenous insulin production which
requires external administration for survival. Genetic factors and environmental triggers are often
implicated in the onset of this chronic condition. Patients typically present with symptoms such as
polyuria, polydipsia, and significant weight loss. Unlike Type 2, this is not primarily driven by lifestyle
factors or insulin resistance initially. It is most commonly diagnosed in children and young adults
although it can occur later.
,2. A patient presents with extreme hyperglycemia, dehydration, and a lack of ketones in the
urine. Which condition is most likely?
A. Diabetic Ketoacidosis
B. Hypoglycemic Unawareness
C. Hyperosmolar Hyperglycemic State
D. Metabolic Syndrome
Ans: C
Rationale: Hyperosmolar Hyperglycemic State or HHS is a serious complication primarily seen in Type 2
diabetes. It is characterized by extremely high blood glucose levels often exceeding 600 mg/dL. Because
some insulin is still present, the body avoids the breakdown of fats and subsequent ketone production.
This lack of ketosis distinguishes it clearly from the more acidic state of diabetic ketoacidosis. Severe
dehydration occurs due to osmotic diuresis caused by the high glucose concentration in the blood.
Treatment focuses heavily on aggressive fluid replacement and careful insulin administration to lower
blood sugar.
3. Which clinical manifestation is a hallmark sign of Grave’s disease?
A. Bradycardia
B. Cold intolerance
C. Weight gain
D. Exophthalmos
Ans: D
,Rationale: Grave’s disease is an autoimmune disorder that results in the overproduction of thyroid
hormones. Exophthalmos is a specific condition where the eyes bulge forward due to inflammation in the
orbital tissues. This occurs because the antibodies attacking the thyroid also affect the tissues behind the
eyes. Other symptoms include tachycardia, heat intolerance, and unintended weight loss despite an
increased appetite. The underlying cause is the production of thyroid-stimulating immunoglobulins that
mimic TSH. Managing this condition often involves medications to block hormone production or
radioactive iodine therapy.
4. What is the primary pathophysiology behind Multiple Sclerosis (MS)?
A. Loss of dopamine-producing neurons
B. Demyelination of central nervous system neurons
C. Destruction of acetylcholine receptors
D. Accumulation of beta-amyloid plaques
Ans: B
Rationale: Multiple Sclerosis is a chronic autoimmune disease that targets the protective myelin sheath
of the CNS. When the myelin is damaged, the transmission of nerve impulses is slowed or completely
blocked. This leads to a variety of neurological symptoms including muscle weakness, vision loss, and
coordination issues. The disease is characterized by periods of exacerbation and remission as the body
attempts to repair damage. Over time, permanent scarring or plaques form on the affected nerve fibers
within the brain and spinal cord. Diagnosis is usually supported by MRI findings showing these specific
lesions in multiple locations.
, 5. Which hormone deficiency is responsible for the development of Diabetes Insipidus?
A. Insulin
B. Antidiuretic Hormone
C. Aldosterone
D. Cortisol
Ans: B
Rationale: Diabetes Insipidus is caused by a deficiency or a decreased response to Antidiuretic Hormone
or ADH. ADH is normally produced by the hypothalamus and stored in the posterior pituitary gland to
regulate water. Without enough ADH, the kidneys are unable to reabsorb water, leading to massive
amounts of dilute urine. Patients experience extreme thirst and are at a high risk for severe dehydration
and electrolyte imbalances. This condition is separate from diabetes mellitus as it does not involve
glucose or insulin metabolism. Treatment typically involves administering a synthetic form of ADH
known as desmopressin.
6. Cushing’s Syndrome is caused by an excess of which hormone?
A. Cortisol
B. Growth Hormone
C. Thyroxine
D. Epinephrine
Ans: A
