CHAMBERLAIN UNIVERSITY NR-283 PATHOPHYSIOLOGY EXAM 1 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027..
Core Domains
* Cellular Injury and Adaptation
* Genetic and Congenital Disorders
* Fluid, Electrolyte, and Acid-Base Balance
* Stress and Disease
* Innate and Adaptive Immunity
* Inflammation and Tissue Repair
* Neoplasia and Cancer Biology
* Infectious Disease Processes
Introduction
*This comprehensive assessment is designed to evaluate student proficiency in core pathophysiology concepts essential for clinical nu
SECTION ONE: QUESTIONS 1-100
Which cellular adaptation occurs in response to chronic irritation, such as smoking in the respiratory tract, leading to a change from
ciliated columnar to stratified squamous epithelium?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Dysplasia
🟢 C. Metaplasia
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type by another, less specialized cell type, often in
response to chronic physical or chemical stress.
A patient presents with localized swelling, redness, and heat following a laceration. Which chemical mediator is primarily responsible
for the vasodilation seen in the initial phase of inflammation?
,A. Histamine
B. Complement C3b
C. Interleukin-1
D. Prostaglandins
🟢 A. Histamine
🔴 RATIONALE: Histamine is released by mast cells and is a potent vasodilator that increases capillary permeability during the acute
inflammatory response.
Which electrolyte imbalance is most likely to cause cardiac dysrhythmias, muscle weakness, and decreased deep tendon reflexes?
A. Hyponatremia
B. Hyperkalemia
C. Hypocalcemia
D. Hypernatremia
🟢 B. Hyperkalemia
🔴 RATIONALE: Excess potassium outside the cell alters the resting membrane potential, leading to impaired repolarization, which
manifests as cardiac arrhythmias and neuromuscular weakness.
During the General Adaptation Syndrome, which stage involves the activation of the sympathetic nervous system and the "fight or
flight" response?
A. Resistance
B. Exhaustion
C. Alarm
D. Recovery
🟢 C. Alarm
🔴 RATIONALE: The alarm stage is the initial reaction to a stressor, characterized by the activation of the hypothalamic-pituitary-
adrenal axis and the release of catecholamines.
A patient with lung cancer is found to have elevated calcium levels due to the secretion of parathyroid hormone-related protein
(PTHrP). This is an example of:
A. Autocrine signaling
B. Paraneoplastic syndrome
C. Genetic mutation
D. Metastasis
🟢 B. Paraneoplastic syndrome
🔴 RATIONALE: Paraneoplastic syndromes occur when substances produced by tumor cells (like hormones or cytokines) cause
systemic effects unrelated to the physical presence of the tumor.
, What is the primary function of the major histocompatibility complex (MHC) class I molecules?
A. Presenting exogenous antigens to Helper T cells
B. Initiating the complement cascade
C. Presenting endogenous antigens to Cytotoxic T cells
D. Producing antibodies
🟢 C. Presenting endogenous antigens to Cytotoxic T cells
🔴 RATIONALE: MHC class I molecules are found on all nucleated cells and present endogenous antigens to CD8+ T cells (Cytotoxic
T cells) to signal cellular infection or abnormality.
Which type of necrosis is most commonly associated with hypoxic death of cells within the brain?
A. Coagulative
B. Liquefactive
C. Caseous
D. Fat
🟢 B. Liquefactive
🔴 RATIONALE: Liquefactive necrosis occurs when hydrolytic enzymes cause the tissue to become soft and liquefied, which is
characteristic of brain tissue death.
A 45-year-old patient has a blood pH of 7.30 and a PaCO2 of 50 mmHg. Which acid-base imbalance is present?
A. Metabolic acidosis
B. Respiratory alkalosis
C. Respiratory acidosis
D. Metabolic alkalosis
🟢 C. Respiratory acidosis
🔴 RATIONALE: A pH below 7.35 indicates acidosis, and a PaCO2 above 45 mmHg indicates a respiratory cause, suggesting
hypoventilation.
Which gene, when mutated, is often referred to as the "guardian of the genome" because it triggers apoptosis in cells with damaged
DNA?
A. BRCA1
B. TP53
C. HER2
D. RAS
🟢 B. TP53
🔴 RATIONALE: The TP53 gene encodes the p53 protein, which prevents the replication of cells with damaged DNA by initiating cell
cycle arrest or apoptosis.
PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027..
Core Domains
* Cellular Injury and Adaptation
* Genetic and Congenital Disorders
* Fluid, Electrolyte, and Acid-Base Balance
* Stress and Disease
* Innate and Adaptive Immunity
* Inflammation and Tissue Repair
* Neoplasia and Cancer Biology
* Infectious Disease Processes
Introduction
*This comprehensive assessment is designed to evaluate student proficiency in core pathophysiology concepts essential for clinical nu
SECTION ONE: QUESTIONS 1-100
Which cellular adaptation occurs in response to chronic irritation, such as smoking in the respiratory tract, leading to a change from
ciliated columnar to stratified squamous epithelium?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Dysplasia
🟢 C. Metaplasia
🔴 RATIONALE: Metaplasia is the reversible replacement of one mature cell type by another, less specialized cell type, often in
response to chronic physical or chemical stress.
A patient presents with localized swelling, redness, and heat following a laceration. Which chemical mediator is primarily responsible
for the vasodilation seen in the initial phase of inflammation?
,A. Histamine
B. Complement C3b
C. Interleukin-1
D. Prostaglandins
🟢 A. Histamine
🔴 RATIONALE: Histamine is released by mast cells and is a potent vasodilator that increases capillary permeability during the acute
inflammatory response.
Which electrolyte imbalance is most likely to cause cardiac dysrhythmias, muscle weakness, and decreased deep tendon reflexes?
A. Hyponatremia
B. Hyperkalemia
C. Hypocalcemia
D. Hypernatremia
🟢 B. Hyperkalemia
🔴 RATIONALE: Excess potassium outside the cell alters the resting membrane potential, leading to impaired repolarization, which
manifests as cardiac arrhythmias and neuromuscular weakness.
During the General Adaptation Syndrome, which stage involves the activation of the sympathetic nervous system and the "fight or
flight" response?
A. Resistance
B. Exhaustion
C. Alarm
D. Recovery
🟢 C. Alarm
🔴 RATIONALE: The alarm stage is the initial reaction to a stressor, characterized by the activation of the hypothalamic-pituitary-
adrenal axis and the release of catecholamines.
A patient with lung cancer is found to have elevated calcium levels due to the secretion of parathyroid hormone-related protein
(PTHrP). This is an example of:
A. Autocrine signaling
B. Paraneoplastic syndrome
C. Genetic mutation
D. Metastasis
🟢 B. Paraneoplastic syndrome
🔴 RATIONALE: Paraneoplastic syndromes occur when substances produced by tumor cells (like hormones or cytokines) cause
systemic effects unrelated to the physical presence of the tumor.
, What is the primary function of the major histocompatibility complex (MHC) class I molecules?
A. Presenting exogenous antigens to Helper T cells
B. Initiating the complement cascade
C. Presenting endogenous antigens to Cytotoxic T cells
D. Producing antibodies
🟢 C. Presenting endogenous antigens to Cytotoxic T cells
🔴 RATIONALE: MHC class I molecules are found on all nucleated cells and present endogenous antigens to CD8+ T cells (Cytotoxic
T cells) to signal cellular infection or abnormality.
Which type of necrosis is most commonly associated with hypoxic death of cells within the brain?
A. Coagulative
B. Liquefactive
C. Caseous
D. Fat
🟢 B. Liquefactive
🔴 RATIONALE: Liquefactive necrosis occurs when hydrolytic enzymes cause the tissue to become soft and liquefied, which is
characteristic of brain tissue death.
A 45-year-old patient has a blood pH of 7.30 and a PaCO2 of 50 mmHg. Which acid-base imbalance is present?
A. Metabolic acidosis
B. Respiratory alkalosis
C. Respiratory acidosis
D. Metabolic alkalosis
🟢 C. Respiratory acidosis
🔴 RATIONALE: A pH below 7.35 indicates acidosis, and a PaCO2 above 45 mmHg indicates a respiratory cause, suggesting
hypoventilation.
Which gene, when mutated, is often referred to as the "guardian of the genome" because it triggers apoptosis in cells with damaged
DNA?
A. BRCA1
B. TP53
C. HER2
D. RAS
🟢 B. TP53
🔴 RATIONALE: The TP53 gene encodes the p53 protein, which prevents the replication of cells with damaged DNA by initiating cell
cycle arrest or apoptosis.
