SCI 225 PATHOPHYSIOLOGY FINAL
MEDICAL TEST EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF.
Core Domains
• Cellular Adaptation, Injury, and Death
• Genetics and Genetic Disorders
• Inflammation and Immune Response
• Fluid, Electrolyte, and Acid-Base Balance
• Cardiovascular Pathophysiology
• Respiratory Pathophysiology
• Renal and Urinary Pathophysiology
• Gastrointestinal and Hepatobiliary Pathophysiology
• Endocrine Pathophysiology
• Neurological and Musculoskeletal Pathophysiology
Introduction
This examination evaluates comprehensive understanding of pathophysiological
concepts essential for health science practice. It assesses knowledge of disease
mechanisms, cellular alterations, and systemic responses across the lifespan. The test
employs multiple-choice and scenario-based questions that require critical thinking
and clinical application of pathophysiological principles. Emphasis is placed on linking
underlying mechanisms to clinical manifestations, diagnostic findings, and treatment
rationale. This assessment serves as a measure of readiness for professional practice
and evidence-based clinical decision-making.
Section One: Questions 1–100
1. A patient with chronic hypertension develops left ventricular hypertrophy.
Which type of cellular adaptation does this represent?
,A. Hyperplasia
B. Hypertrophy
C. Metaplasia
D. Atrophy
B. Hypertrophy
RATIONALE: Hypertrophy is an increase in cell size, often in response to
increased workload. In hypertension, the left ventricle undergoes hypertrophy to
compensate for increased afterload. Hyperplasia is an increase in cell number;
metaplasia is a change in cell type; atrophy is a decrease in cell size.
2. Which of the following is the primary mechanism of cell injury in ischemia?
A. ATP depletion
B. Free radical formation
C. Calcium influx
D. Membrane pump failure
A. ATP depletion
RATIONALE: Ischemia reduces oxygen delivery, leading to decreased oxidative
phosphorylation and ATP depletion. This is the initial and most critical event,
causing failure of ATP-dependent ion pumps, leading to cell swelling and death.
3. A biopsy of the cervix shows disorganized, atypical cells that have not
invaded the basement membrane. This finding is most consistent with:
A. Metaplasia
B. Dysplasia
C. Neoplasia
D. Anaplasia
B. Dysplasia
RATIONALE: Dysplasia is characterized by disordered, atypical cells that have
not breached the basement membrane. It is a pre-cancerous condition. Metaplasia is
a reversible change to a different cell type. Neoplasia implies autonomous growth.
Anaplasia is a lack of differentiation, seen in malignant tumors.
4. Which of the following is a hallmark of apoptosis?
A. Cell swelling and lysis
B. Inflammatory response
,C. Programmed cell death without inflammation
D. Random DNA fragmentation
C. Programmed cell death without inflammation
RATIONALE: Apoptosis is a regulated, energy-dependent process of
programmed cell death that does not incite inflammation. Necrosis, in contrast,
causes cell swelling, lysis, and inflammation.
5. A patient has a mutation in the CFTR gene. Which pathophysiological process
is most directly affected?
A. Chloride transport across epithelial membranes
B. Sodium reabsorption in the proximal tubule
C. Potassium excretion in the distal tubule
D. Glucose reabsorption in the intestine
A. Chloride transport across epithelial membranes
RATIONALE: The CFTR gene encodes a chloride channel. Mutations lead to
defective chloride transport, causing thick, viscous secretions in lungs, pancreas,
and other organs, characteristic of cystic fibrosis.
6. In autosomal recessive inheritance, what is the probability that a child will be
affected if both parents are carriers?
A. 0%
B. 25%
C. 50%
D. 75%
B. 25%
RATIONALE: If both parents are carriers (heterozygous), each pregnancy has a
25% chance of an affected child (homozygous recessive), a 50% chance of a carrier
child, and a 25% chance of a homozygous normal child.
7. Which immunoglobulin is primarily responsible for allergic reactions (Type I
hypersensitivity)?
A. IgA
B. IgG
C. IgM
D. IgE
, D. IgE
RATIONALE: IgE binds to mast cells and basophils. Upon allergen exposure, it
triggers degranulation and release of histamine and other mediators, causing Type I
hypersensitivity reactions (e.g., anaphylaxis, allergies).
8. A patient with systemic lupus erythematosus (SLE) is most likely to have which
type of hypersensitivity reaction?
A. Type I
B. Type II
C. Type III
D. Type IV
C. Type III
RATIONALE: SLE is a classic example of Type III hypersensitivity, where immune
complexes (antigen-antibody) deposit in tissues, activate complement, and cause
inflammation and tissue damage.
9. Which cytokine is the primary mediator of the acute phase response,
including fever and increased CRP?
A. Interleukin-1 (IL-1)
B. Interleukin-4 (IL-4)
C. Interferon-gamma (IFN-γ)
D. Tumor necrosis factor-beta (TNF-β)
A. Interleukin-1 (IL-1)
RATIONALE: IL-1 is a key pro-inflammatory cytokine that induces fever, acute
phase protein synthesis (e.g., CRP), and acts on the hypothalamus. TNF-α also plays
a role, but IL-1 is a primary mediator.
10. A patient has a deficiency in the complement protein C3. Which process is
most directly impaired?
A. Opsonization and clearance of pathogens
B. Antibody production
C. T-cell activation
D. Mast cell degranulation
A. Opsonization and clearance of pathogens
MEDICAL TEST EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF.
Core Domains
• Cellular Adaptation, Injury, and Death
• Genetics and Genetic Disorders
• Inflammation and Immune Response
• Fluid, Electrolyte, and Acid-Base Balance
• Cardiovascular Pathophysiology
• Respiratory Pathophysiology
• Renal and Urinary Pathophysiology
• Gastrointestinal and Hepatobiliary Pathophysiology
• Endocrine Pathophysiology
• Neurological and Musculoskeletal Pathophysiology
Introduction
This examination evaluates comprehensive understanding of pathophysiological
concepts essential for health science practice. It assesses knowledge of disease
mechanisms, cellular alterations, and systemic responses across the lifespan. The test
employs multiple-choice and scenario-based questions that require critical thinking
and clinical application of pathophysiological principles. Emphasis is placed on linking
underlying mechanisms to clinical manifestations, diagnostic findings, and treatment
rationale. This assessment serves as a measure of readiness for professional practice
and evidence-based clinical decision-making.
Section One: Questions 1–100
1. A patient with chronic hypertension develops left ventricular hypertrophy.
Which type of cellular adaptation does this represent?
,A. Hyperplasia
B. Hypertrophy
C. Metaplasia
D. Atrophy
B. Hypertrophy
RATIONALE: Hypertrophy is an increase in cell size, often in response to
increased workload. In hypertension, the left ventricle undergoes hypertrophy to
compensate for increased afterload. Hyperplasia is an increase in cell number;
metaplasia is a change in cell type; atrophy is a decrease in cell size.
2. Which of the following is the primary mechanism of cell injury in ischemia?
A. ATP depletion
B. Free radical formation
C. Calcium influx
D. Membrane pump failure
A. ATP depletion
RATIONALE: Ischemia reduces oxygen delivery, leading to decreased oxidative
phosphorylation and ATP depletion. This is the initial and most critical event,
causing failure of ATP-dependent ion pumps, leading to cell swelling and death.
3. A biopsy of the cervix shows disorganized, atypical cells that have not
invaded the basement membrane. This finding is most consistent with:
A. Metaplasia
B. Dysplasia
C. Neoplasia
D. Anaplasia
B. Dysplasia
RATIONALE: Dysplasia is characterized by disordered, atypical cells that have
not breached the basement membrane. It is a pre-cancerous condition. Metaplasia is
a reversible change to a different cell type. Neoplasia implies autonomous growth.
Anaplasia is a lack of differentiation, seen in malignant tumors.
4. Which of the following is a hallmark of apoptosis?
A. Cell swelling and lysis
B. Inflammatory response
,C. Programmed cell death without inflammation
D. Random DNA fragmentation
C. Programmed cell death without inflammation
RATIONALE: Apoptosis is a regulated, energy-dependent process of
programmed cell death that does not incite inflammation. Necrosis, in contrast,
causes cell swelling, lysis, and inflammation.
5. A patient has a mutation in the CFTR gene. Which pathophysiological process
is most directly affected?
A. Chloride transport across epithelial membranes
B. Sodium reabsorption in the proximal tubule
C. Potassium excretion in the distal tubule
D. Glucose reabsorption in the intestine
A. Chloride transport across epithelial membranes
RATIONALE: The CFTR gene encodes a chloride channel. Mutations lead to
defective chloride transport, causing thick, viscous secretions in lungs, pancreas,
and other organs, characteristic of cystic fibrosis.
6. In autosomal recessive inheritance, what is the probability that a child will be
affected if both parents are carriers?
A. 0%
B. 25%
C. 50%
D. 75%
B. 25%
RATIONALE: If both parents are carriers (heterozygous), each pregnancy has a
25% chance of an affected child (homozygous recessive), a 50% chance of a carrier
child, and a 25% chance of a homozygous normal child.
7. Which immunoglobulin is primarily responsible for allergic reactions (Type I
hypersensitivity)?
A. IgA
B. IgG
C. IgM
D. IgE
, D. IgE
RATIONALE: IgE binds to mast cells and basophils. Upon allergen exposure, it
triggers degranulation and release of histamine and other mediators, causing Type I
hypersensitivity reactions (e.g., anaphylaxis, allergies).
8. A patient with systemic lupus erythematosus (SLE) is most likely to have which
type of hypersensitivity reaction?
A. Type I
B. Type II
C. Type III
D. Type IV
C. Type III
RATIONALE: SLE is a classic example of Type III hypersensitivity, where immune
complexes (antigen-antibody) deposit in tissues, activate complement, and cause
inflammation and tissue damage.
9. Which cytokine is the primary mediator of the acute phase response,
including fever and increased CRP?
A. Interleukin-1 (IL-1)
B. Interleukin-4 (IL-4)
C. Interferon-gamma (IFN-γ)
D. Tumor necrosis factor-beta (TNF-β)
A. Interleukin-1 (IL-1)
RATIONALE: IL-1 is a key pro-inflammatory cytokine that induces fever, acute
phase protein synthesis (e.g., CRP), and acts on the hypothalamus. TNF-α also plays
a role, but IL-1 is a primary mediator.
10. A patient has a deficiency in the complement protein C3. Which process is
most directly impaired?
A. Opsonization and clearance of pathogens
B. Antibody production
C. T-cell activation
D. Mast cell degranulation
A. Opsonization and clearance of pathogens
