D236 OA 4 Actual Exam V1 | D236 Pathophysiology (D236 OA 4) |
Western Governors University PDF
1. Which neurotransmitter deficiency is the primary hallmark of Parkinson’s disease?
A. Acetylcholine
B. Serotonin
C. Dopamine
D. Gamma-aminobutyric acid (GABA)
Answer: C
Rationale: Parkinson’s disease involves the progressive destruction of nigrostriatal
dopamine neurons in the substantia nigra. This depletion leads to an imbalance between
excitatory and inhibitory signals in the basal ganglia. As a result, patients exhibit classic
motor symptoms such as tremors, bradykinesia, and postural instability.
2. In Multiple Sclerosis (MS), the immune system attacks which structure in the central
nervous system?
A. The myelin sheath
B. The neuronal cell body
C. The synaptic cleft
D. The dendrites
Answer: A
Rationale: Multiple Sclerosis is an autoimmune condition where T-cells and B-cells cross
the blood-brain barrier and attack the myelin sheath surrounding axons. This
demyelination slows or blocks nerve impulse conduction, leading to a wide variety of
neurological deficits. Over time, the formation of sclerotic plaques can cause permanent
axonal damage and disability.
3. Which mechanism describes Type I Hypersensitivity?
A. IgE-mediated mast cell degranulation
B. Cytotoxic antibody-mediated cell lysis
C. Immune complex deposition in tissues
D. Delayed-type T-cell mediated response
Answer: A
,Rationale: Type I hypersensitivity is an immediate allergic reaction triggered when an
allergen binds to IgE antibodies already fixed to mast cells and basophils. This binding
causes the release of inflammatory mediators like histamine, leukotrienes, and
prostaglandins. These substances cause systemic effects such as vasodilation, bronchial
constriction, and increased capillary permeability.
4. A patient presents with a ‘butterfly rash’ across the cheeks and bridge of the nose. Which
condition is most likely?
A. Psoriasis
B. Rheumatoid Arthritis
C. Systemic Lupus Erythematosus (SLE)
D. Atopic Dermatitis
Answer: C
Rationale: Systemic Lupus Erythematosus is a chronic autoimmune disease characterized
by the production of autoantibodies against self-antigens, such as double-stranded DNA.
The classic malar or ‘butterfly rash’ is a prominent cutaneous manifestation of the disease.
This condition can affect multiple organ systems, including the kidneys, joints, and serous
membranes.
5. What is the primary pathophysiological change in Osteoarthritis?
A. Systemic inflammation of the synovial membrane
B. Loss of articular cartilage due to mechanical wear and tear
C. Uric acid crystal deposition in the joint space
D. Infection within the bone marrow
Answer: B
Rationale: Osteoarthritis is a degenerative joint disease characterized by the progressive
erosion of articular cartilage. As the cartilage thins, the underlying bone is exposed, leading
to the formation of bone spurs or osteophytes. This process is generally considered ‘wear
and tear’ and lacks the systemic inflammatory components seen in rheumatoid arthritis.
6. Which hormone imbalance is typically found in Polycystic Ovary Syndrome (PCOS)?
A. Elevated levels of androgens
B. Low levels of testosterone
C. High levels of follicle-stimulating hormone (FSH)
D. Low levels of insulin
Answer: A
, Rationale: PCOS is characterized by hyperandrogenism, which leads to symptoms like
hirsutism, acne, and ovulatory dysfunction. The excess androgens interfere with the normal
development of follicles, leading to the formation of many small cysts on the ovaries.
Additionally, many patients with PCOS also exhibit insulin resistance and
hyperinsulinemia.
7. Which stage of a pressure ulcer is characterized by full-thickness skin loss involving damage
to subcutaneous tissue but not fascia?
A. Stage I
B. Stage II
C. Stage IV
D. Stage III
Answer: D
Rationale: Stage III pressure ulcers involve full-thickness skin loss where subcutaneous fat
may be visible, but bone, tendon, or muscle are not exposed. Slough or eschar may be
present but does not obscure the depth of tissue loss. It is distinguished from Stage IV by
the lack of exposure of deep structures like bone or muscle.
8. What is the underlying cause of Rheumatoid Arthritis?
A. Age-related joint degeneration
B. Autoimmune destruction of the synovial membrane
C. Excessive weight-bearing stress on joints
D. Bacterial infection of the joint capsule
Answer: B
Rationale: Rheumatoid Arthritis (RA) is a systemic autoimmune disorder where the
immune system attacks the synovium, the lining of the joints. This results in the formation
of pannus, a layer of vascular fibrous tissue that eventually destroys the cartilage and bone.
Unlike osteoarthritis, RA is characterized by symmetric joint involvement and systemic
symptoms like fatigue and fever.
9. A patient with Alzheimer’s disease has an accumulation of which protein in the brain?
A. Beta-amyloid
B. Dopamine
C. Myelin
D. Hemoglobin
Answer: A
Western Governors University PDF
1. Which neurotransmitter deficiency is the primary hallmark of Parkinson’s disease?
A. Acetylcholine
B. Serotonin
C. Dopamine
D. Gamma-aminobutyric acid (GABA)
Answer: C
Rationale: Parkinson’s disease involves the progressive destruction of nigrostriatal
dopamine neurons in the substantia nigra. This depletion leads to an imbalance between
excitatory and inhibitory signals in the basal ganglia. As a result, patients exhibit classic
motor symptoms such as tremors, bradykinesia, and postural instability.
2. In Multiple Sclerosis (MS), the immune system attacks which structure in the central
nervous system?
A. The myelin sheath
B. The neuronal cell body
C. The synaptic cleft
D. The dendrites
Answer: A
Rationale: Multiple Sclerosis is an autoimmune condition where T-cells and B-cells cross
the blood-brain barrier and attack the myelin sheath surrounding axons. This
demyelination slows or blocks nerve impulse conduction, leading to a wide variety of
neurological deficits. Over time, the formation of sclerotic plaques can cause permanent
axonal damage and disability.
3. Which mechanism describes Type I Hypersensitivity?
A. IgE-mediated mast cell degranulation
B. Cytotoxic antibody-mediated cell lysis
C. Immune complex deposition in tissues
D. Delayed-type T-cell mediated response
Answer: A
,Rationale: Type I hypersensitivity is an immediate allergic reaction triggered when an
allergen binds to IgE antibodies already fixed to mast cells and basophils. This binding
causes the release of inflammatory mediators like histamine, leukotrienes, and
prostaglandins. These substances cause systemic effects such as vasodilation, bronchial
constriction, and increased capillary permeability.
4. A patient presents with a ‘butterfly rash’ across the cheeks and bridge of the nose. Which
condition is most likely?
A. Psoriasis
B. Rheumatoid Arthritis
C. Systemic Lupus Erythematosus (SLE)
D. Atopic Dermatitis
Answer: C
Rationale: Systemic Lupus Erythematosus is a chronic autoimmune disease characterized
by the production of autoantibodies against self-antigens, such as double-stranded DNA.
The classic malar or ‘butterfly rash’ is a prominent cutaneous manifestation of the disease.
This condition can affect multiple organ systems, including the kidneys, joints, and serous
membranes.
5. What is the primary pathophysiological change in Osteoarthritis?
A. Systemic inflammation of the synovial membrane
B. Loss of articular cartilage due to mechanical wear and tear
C. Uric acid crystal deposition in the joint space
D. Infection within the bone marrow
Answer: B
Rationale: Osteoarthritis is a degenerative joint disease characterized by the progressive
erosion of articular cartilage. As the cartilage thins, the underlying bone is exposed, leading
to the formation of bone spurs or osteophytes. This process is generally considered ‘wear
and tear’ and lacks the systemic inflammatory components seen in rheumatoid arthritis.
6. Which hormone imbalance is typically found in Polycystic Ovary Syndrome (PCOS)?
A. Elevated levels of androgens
B. Low levels of testosterone
C. High levels of follicle-stimulating hormone (FSH)
D. Low levels of insulin
Answer: A
, Rationale: PCOS is characterized by hyperandrogenism, which leads to symptoms like
hirsutism, acne, and ovulatory dysfunction. The excess androgens interfere with the normal
development of follicles, leading to the formation of many small cysts on the ovaries.
Additionally, many patients with PCOS also exhibit insulin resistance and
hyperinsulinemia.
7. Which stage of a pressure ulcer is characterized by full-thickness skin loss involving damage
to subcutaneous tissue but not fascia?
A. Stage I
B. Stage II
C. Stage IV
D. Stage III
Answer: D
Rationale: Stage III pressure ulcers involve full-thickness skin loss where subcutaneous fat
may be visible, but bone, tendon, or muscle are not exposed. Slough or eschar may be
present but does not obscure the depth of tissue loss. It is distinguished from Stage IV by
the lack of exposure of deep structures like bone or muscle.
8. What is the underlying cause of Rheumatoid Arthritis?
A. Age-related joint degeneration
B. Autoimmune destruction of the synovial membrane
C. Excessive weight-bearing stress on joints
D. Bacterial infection of the joint capsule
Answer: B
Rationale: Rheumatoid Arthritis (RA) is a systemic autoimmune disorder where the
immune system attacks the synovium, the lining of the joints. This results in the formation
of pannus, a layer of vascular fibrous tissue that eventually destroys the cartilage and bone.
Unlike osteoarthritis, RA is characterized by symmetric joint involvement and systemic
symptoms like fatigue and fever.
9. A patient with Alzheimer’s disease has an accumulation of which protein in the brain?
A. Beta-amyloid
B. Dopamine
C. Myelin
D. Hemoglobin
Answer: A
