NSG530 Final Exam V3 | NSG 530
Advanced Pathophysiology | Wilkes
University
1. Which cellular adaptation is characterized by an increase in the size of cells in response to
increased mechanical load or stress, such as in the myocardium of a patient with chronic
hypertension?
A. Hyperplasia
B. Atrophy
C. Hypertrophy
D. Metaplasia
Answer: C
Rationale: Hypertrophy involves an increase in the actual size of the cell rather than the
number of cells. In the heart, this is often a compensatory mechanism to handle higher
workloads. Long-term hypertrophy can lead to cardiac dysfunction and failure if the
underlying stress is not managed effectively.
2. What is the primary pathophysiological mechanism behind the development of Type 1
Diabetes Mellitus?
A. Peripheral insulin resistance
B. Excessive glucagon secretion
,C. Down-regulation of insulin receptors
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes is primarily characterized by the immune-mediated
destruction of pancreatic beta cells, leading to absolute insulin deficiency. This process
involves T-cell infiltration and the presence of islet cell antibodies. Patients require
exogenous insulin for survival because the body cannot produce its own.
3. In the context of the Renin-Angiotensin-Aldosterone System (RAAS), what is the direct
effect of Angiotensin II on the vascular system?
A. Potent systemic vasodilation
B. Potent systemic vasoconstriction
C. Decreased peripheral resistance
D. Inhibition of aldosterone release
Answer: B
Rationale: Angiotensin II is a powerful vasoconstrictor that increases systemic vascular
resistance and blood pressure. It also stimulates the adrenal cortex to release aldosterone,
which promotes sodium and water retention. This system is a critical regulator of blood
volume and long-term blood pressure control.
, 4. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
degranulation of mast cells and basophils?
A. Type I Hypersensitivity
B. Type II Hypersensitivity
C. Type III Hypersensitivity
D. Type IV Hypersensitivity
Answer: A
Rationale: Type I hypersensitivity reactions involve an immediate allergic response
triggered by the binding of an allergen to IgE on mast cells. This leads to the release of
inflammatory mediators like histamine and leukotrienes. Common examples include
asthma, hay fever, and life-threatening anaphylaxis.
5. What is the underlying cause of the neurological symptoms observed in Multiple Sclerosis?
A. Depletion of dopamine in the substantia nigra
B. Demyelination of axons in the central nervous system
C. Accumulation of amyloid-beta plaques
D. Destruction of acetylcholine receptors at the neuromuscular junction
Answer: B
Rationale: Multiple Sclerosis is an autoimmune disorder where the immune system
attacks the myelin sheath surrounding nerve fibers in the brain and spinal cord. This
Advanced Pathophysiology | Wilkes
University
1. Which cellular adaptation is characterized by an increase in the size of cells in response to
increased mechanical load or stress, such as in the myocardium of a patient with chronic
hypertension?
A. Hyperplasia
B. Atrophy
C. Hypertrophy
D. Metaplasia
Answer: C
Rationale: Hypertrophy involves an increase in the actual size of the cell rather than the
number of cells. In the heart, this is often a compensatory mechanism to handle higher
workloads. Long-term hypertrophy can lead to cardiac dysfunction and failure if the
underlying stress is not managed effectively.
2. What is the primary pathophysiological mechanism behind the development of Type 1
Diabetes Mellitus?
A. Peripheral insulin resistance
B. Excessive glucagon secretion
,C. Down-regulation of insulin receptors
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes is primarily characterized by the immune-mediated
destruction of pancreatic beta cells, leading to absolute insulin deficiency. This process
involves T-cell infiltration and the presence of islet cell antibodies. Patients require
exogenous insulin for survival because the body cannot produce its own.
3. In the context of the Renin-Angiotensin-Aldosterone System (RAAS), what is the direct
effect of Angiotensin II on the vascular system?
A. Potent systemic vasodilation
B. Potent systemic vasoconstriction
C. Decreased peripheral resistance
D. Inhibition of aldosterone release
Answer: B
Rationale: Angiotensin II is a powerful vasoconstrictor that increases systemic vascular
resistance and blood pressure. It also stimulates the adrenal cortex to release aldosterone,
which promotes sodium and water retention. This system is a critical regulator of blood
volume and long-term blood pressure control.
, 4. Which type of hypersensitivity reaction is mediated by IgE antibodies and involves the
degranulation of mast cells and basophils?
A. Type I Hypersensitivity
B. Type II Hypersensitivity
C. Type III Hypersensitivity
D. Type IV Hypersensitivity
Answer: A
Rationale: Type I hypersensitivity reactions involve an immediate allergic response
triggered by the binding of an allergen to IgE on mast cells. This leads to the release of
inflammatory mediators like histamine and leukotrienes. Common examples include
asthma, hay fever, and life-threatening anaphylaxis.
5. What is the underlying cause of the neurological symptoms observed in Multiple Sclerosis?
A. Depletion of dopamine in the substantia nigra
B. Demyelination of axons in the central nervous system
C. Accumulation of amyloid-beta plaques
D. Destruction of acetylcholine receptors at the neuromuscular junction
Answer: B
Rationale: Multiple Sclerosis is an autoimmune disorder where the immune system
attacks the myelin sheath surrounding nerve fibers in the brain and spinal cord. This
