NR507 | NR507 Advanced Pathophysiology Final
Exam v1 | Questions with Correct Answers and
Expert Explanation for Each Question |
Chamberlain
1. A patient is diagnosed with secondary hypertension. Which of the following conditions is a
common cause of this type of hypertension?
A. Essential hypertension
B. High sodium intake
C. Renal artery stenosis
D. Sedentary lifestyle
Correct Answer: C
Expert Explanation: Secondary hypertension is caused by an underlying identifiable
systemic disease or condition that raises peripheral vascular resistance or cardiac output.
Renal artery stenosis is a classic cause because it triggers the renin-angiotensin-
aldosterone system due to perceived low blood flow to the kidney. In contrast, essential
hypertension has no single identifiable cause and is often related to genetics and lifestyle.
2. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
release of histamine from mast cells?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct Answer: A
Expert Explanation: Type I hypersensitivity reactions are immediate allergic reactions
mediated by IgE binding to mast cells. This binding causes degranulation and the release of
histamine, leading to symptoms like edema and bronchoconstriction. Types II, III, and IV
involve different mechanisms such as IgG/IgM tissue-specific reactions, immune complex
deposition, or T-cell mediation respectively.
3. In the pathophysiology of Type 1 Diabetes Mellitus, what is the primary cause of insulin
deficiency?
A. Insulin resistance in peripheral tissues
B. Hypertrophy of the islets of Langerhans
,C. Excessive glucagon secretion
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute lack of
insulin. This occurs because the body’s immune system mistakenly attacks and destroys
the insulin-producing beta cells in the pancreas. Without these cells, the body cannot
regulate blood glucose levels, leading to hyperglycemia and requiring exogenous insulin
therapy.
4. A patient presents with symptoms of polyuria, polydipsia, and unexplained weight loss.
Which laboratory result is most indicative of diabetes mellitus?
A. Fasting plasma glucose of 100 mg/dL
B. Random plasma glucose of 250 mg/dL
C. Hemoglobin A1c of 5.0%
D. Post-prandial glucose of 130 mg/dL
Correct Answer: B
Expert Explanation: A random plasma glucose level of 200 mg/dL or higher in a patient
with classic symptoms of hyperglycemia is diagnostic for diabetes mellitus. The standard
diagnostic criteria also include a fasting plasma glucose of 126 mg/dL or higher or an A1c
of 6.5% or higher. Polyuria and polydipsia are hallmark clinical manifestations resulting
from osmotic diuresis caused by excess glucose in the urine.
5. Which compensatory mechanism is activated by the body in response to a state of chronic
heart failure?
A. Inhibition of the sympathetic nervous system
B. Peripheral vasodilation
C. Decreased secretion of antidiuretic hormone (ADH)
D. Activation of the renin-angiotensin-aldosterone system (RAAS)
Correct Answer: D
Expert Explanation: When cardiac output falls in heart failure, the body activates the
RAAS to maintain blood pressure and perfusion to vital organs. This leads to sodium and
water retention, which increases blood volume and preload. While initially helpful, chronic
activation of this system eventually leads to cardiac remodeling and worsening of the heart
failure state.
6. What is the primary pathophysiology behind the development of atherosclerotic plaques?
A. Endothelial injury and lipid accumulation
, B. Infection of the vascular smooth muscle
C. Decreased levels of LDL cholesterol
D. Atrophy of the arterial wall
Correct Answer: A
Expert Explanation: Atherosclerosis begins with injury to the endothelial lining of the
arteries, often caused by hypertension or smoking. This injury allows LDL cholesterol to
enter the vessel wall, where it becomes oxidized and is engulfed by macrophages, forming
foam cells. These foam cells aggregate to form a fatty streak, which eventually evolves into
a complex fibrous plaque.
7. A patient with chronic kidney disease (CKD) often develops anemia. What is the primary
cause of this condition in CKD patients?
A. Iron deficiency due to poor diet
B. Chronic blood loss during dialysis
C. Inadequate production of erythropoietin by the kidneys
D. Premature destruction of red blood cells in the spleen
Correct Answer: C
Expert Explanation: The kidneys are responsible for producing erythropoietin, a hormone
that stimulates the bone marrow to produce red blood cells. In CKD, the damaged kidneys
cannot produce sufficient erythropoietin, leading to a decrease in RBC production. This
results in a normocytic, normochromic anemia that is often treated with synthetic
erythropoiesis-stimulating agents.
8. Which of the following describes the pathophysiology of Multiple Sclerosis (MS)?
A. Degeneration of lower motor neurons
B. Demyelination of neurons in the central nervous system
C. Depletion of dopamine in the basal ganglia
D. Excessive acetylcholine at the neuromuscular junction
Correct Answer: B
Expert Explanation: Multiple Sclerosis is a chronic inflammatory disease where the
immune system attacks the myelin sheath surrounding axons in the brain and spinal cord.
This demyelination interrupts nerve impulses, leading to a wide range of neurological
deficits such as vision loss and motor weakness. It is characterized by periods of
exacerbation and remission as the CNS attempts to repair the damage.
9. In patients with emphysema, the primary cause of airway obstruction is:
A. Excessive mucus production
Exam v1 | Questions with Correct Answers and
Expert Explanation for Each Question |
Chamberlain
1. A patient is diagnosed with secondary hypertension. Which of the following conditions is a
common cause of this type of hypertension?
A. Essential hypertension
B. High sodium intake
C. Renal artery stenosis
D. Sedentary lifestyle
Correct Answer: C
Expert Explanation: Secondary hypertension is caused by an underlying identifiable
systemic disease or condition that raises peripheral vascular resistance or cardiac output.
Renal artery stenosis is a classic cause because it triggers the renin-angiotensin-
aldosterone system due to perceived low blood flow to the kidney. In contrast, essential
hypertension has no single identifiable cause and is often related to genetics and lifestyle.
2. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
release of histamine from mast cells?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct Answer: A
Expert Explanation: Type I hypersensitivity reactions are immediate allergic reactions
mediated by IgE binding to mast cells. This binding causes degranulation and the release of
histamine, leading to symptoms like edema and bronchoconstriction. Types II, III, and IV
involve different mechanisms such as IgG/IgM tissue-specific reactions, immune complex
deposition, or T-cell mediation respectively.
3. In the pathophysiology of Type 1 Diabetes Mellitus, what is the primary cause of insulin
deficiency?
A. Insulin resistance in peripheral tissues
B. Hypertrophy of the islets of Langerhans
,C. Excessive glucagon secretion
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute lack of
insulin. This occurs because the body’s immune system mistakenly attacks and destroys
the insulin-producing beta cells in the pancreas. Without these cells, the body cannot
regulate blood glucose levels, leading to hyperglycemia and requiring exogenous insulin
therapy.
4. A patient presents with symptoms of polyuria, polydipsia, and unexplained weight loss.
Which laboratory result is most indicative of diabetes mellitus?
A. Fasting plasma glucose of 100 mg/dL
B. Random plasma glucose of 250 mg/dL
C. Hemoglobin A1c of 5.0%
D. Post-prandial glucose of 130 mg/dL
Correct Answer: B
Expert Explanation: A random plasma glucose level of 200 mg/dL or higher in a patient
with classic symptoms of hyperglycemia is diagnostic for diabetes mellitus. The standard
diagnostic criteria also include a fasting plasma glucose of 126 mg/dL or higher or an A1c
of 6.5% or higher. Polyuria and polydipsia are hallmark clinical manifestations resulting
from osmotic diuresis caused by excess glucose in the urine.
5. Which compensatory mechanism is activated by the body in response to a state of chronic
heart failure?
A. Inhibition of the sympathetic nervous system
B. Peripheral vasodilation
C. Decreased secretion of antidiuretic hormone (ADH)
D. Activation of the renin-angiotensin-aldosterone system (RAAS)
Correct Answer: D
Expert Explanation: When cardiac output falls in heart failure, the body activates the
RAAS to maintain blood pressure and perfusion to vital organs. This leads to sodium and
water retention, which increases blood volume and preload. While initially helpful, chronic
activation of this system eventually leads to cardiac remodeling and worsening of the heart
failure state.
6. What is the primary pathophysiology behind the development of atherosclerotic plaques?
A. Endothelial injury and lipid accumulation
, B. Infection of the vascular smooth muscle
C. Decreased levels of LDL cholesterol
D. Atrophy of the arterial wall
Correct Answer: A
Expert Explanation: Atherosclerosis begins with injury to the endothelial lining of the
arteries, often caused by hypertension or smoking. This injury allows LDL cholesterol to
enter the vessel wall, where it becomes oxidized and is engulfed by macrophages, forming
foam cells. These foam cells aggregate to form a fatty streak, which eventually evolves into
a complex fibrous plaque.
7. A patient with chronic kidney disease (CKD) often develops anemia. What is the primary
cause of this condition in CKD patients?
A. Iron deficiency due to poor diet
B. Chronic blood loss during dialysis
C. Inadequate production of erythropoietin by the kidneys
D. Premature destruction of red blood cells in the spleen
Correct Answer: C
Expert Explanation: The kidneys are responsible for producing erythropoietin, a hormone
that stimulates the bone marrow to produce red blood cells. In CKD, the damaged kidneys
cannot produce sufficient erythropoietin, leading to a decrease in RBC production. This
results in a normocytic, normochromic anemia that is often treated with synthetic
erythropoiesis-stimulating agents.
8. Which of the following describes the pathophysiology of Multiple Sclerosis (MS)?
A. Degeneration of lower motor neurons
B. Demyelination of neurons in the central nervous system
C. Depletion of dopamine in the basal ganglia
D. Excessive acetylcholine at the neuromuscular junction
Correct Answer: B
Expert Explanation: Multiple Sclerosis is a chronic inflammatory disease where the
immune system attacks the myelin sheath surrounding axons in the brain and spinal cord.
This demyelination interrupts nerve impulses, leading to a wide range of neurological
deficits such as vision loss and motor weakness. It is characterized by periods of
exacerbation and remission as the CNS attempts to repair the damage.
9. In patients with emphysema, the primary cause of airway obstruction is:
A. Excessive mucus production
