NURS 6501 ADVANCED PATHOPHYSIOLOGY MIDTERM LATEST EXAM/ NURS 6501
MIDTERM EXAM LATEST
Question 1
Which cellular adaptation is characterized by an increase in the number of cells in an organ or
tissue?
A) Hypertrophy
B) Atrophy
C) Hyperplasia
D) Metaplasia
E) Dysplasia
Correct Answer: C) Hyperplasia
Rationale: Hyperplasia refers to an increase in the absolute number of cells within an organ or
tissue, often in response to increased demand, hormonal stimulation, or compensatory
mechanisms. Hypertrophy is an increase in cell size, atrophy is a decrease in cell size/number,
metaplasia is a change in cell type, and dysplasia is deranged cellular growth.
Question 2
A patient with prolonged ischemia to myocardial tissue develops cellular injury. Which cellular
change is irreversible and indicates cell death?
A) Swelling of the endoplasmic reticulum
B) Accumulation of intracellular lipids
C) Mitochondrial calcification
D) Nuclear condensation (pyknosis)
E) Detachment of ribosomes
Correct Answer: D) Nuclear condensation (pyknosis)
Rationale: Irreversible cell injury leading to cell death is characterized by distinctive nuclear
changes. Pyknosis (nuclear condensation), karyorrhexis (nuclear fragmentation), and karyolysis
(nuclear dissolution) are definitive signs of irreversible cell injury and necrosis. The other
options represent reversible cellular changes.
Question 3
The inflammatory response is initiated by several cellular components. Which cell is the primary
initiator of the immediate hypersensitivity (Type I) allergic reaction?
A) Neutrophil
B) Macrophage
C) Mast cell
D) Lymphocyte
E) Eosinophil
Correct Answer: C) Mast cell
Rationale: Mast cells are critical effector cells in Type I (immediate) hypersensitivity reactions.
,Upon re-exposure to an allergen, IgE antibodies bound to mast cell surfaces cross-link,
triggering degranulation and the rapid release of histamine and other inflammatory mediators,
leading to allergic symptoms.
Question 4
A patient presents with signs of systemic inflammation, including fever and increased white
blood cell count. Which inflammatory mediator is primarily responsible for inducing fever?
A) Histamine
B) Prostaglandins
C) Leukotrienes
D) Bradykinin
E) Serotonin
Correct Answer: B) Prostaglandins
Rationale: Prostaglandins, particularly prostaglandin E2 (PGE2), are key mediators in fever
production. They are synthesized at the site of inflammation and act on the thermoregulatory
center in the hypothalamus, raising the body's set point for temperature.
Question 5
What is the primary mechanism by which nonsteroidal anti-inflammatory drugs (NSAIDs) reduce
inflammation and pain?
A) Blocking histamine receptors
B) Inhibiting cyclooxygenase (COX) enzymes
C) Suppressing lymphocyte proliferation
D) Enhancing phagocytic activity
E) Increasing cytokine production
Correct Answer: B) Inhibiting cyclooxygenase (COX) enzymes
Rationale: NSAIDs exert their anti-inflammatory, analgesic, and antipyretic effects by inhibiting
the cyclooxygenase (COX) enzymes (COX-1 and COX-2). COX enzymes are responsible for
synthesizing prostaglandins and thromboxanes, which are central to inflammation, pain, and
fever pathways.
Question 6
Which type of immunity involves the direct production of antibodies by the individual's own
immune system in response to exposure to a pathogen?
A) Passive natural immunity
B) Active natural immunity
C) Passive artificial immunity
D) Active artificial immunity
E) Innate immunity
,Correct Answer: B) Active natural immunity
Rationale: Active natural immunity occurs when an individual's immune system encounters a
pathogen (e.g., through infection) and mounts its own immune response, including the
production of antibodies and memory cells.
Question 7
A patient with a genetic predisposition to a certain disease exhibits the condition only if
exposed to specific environmental triggers. This phenomenon is known as:
A) Penetrance
B) Expressivity
C) Multifactorial inheritance
D) Epigenetics
E) Pleiotropy
Correct Answer: C) Multifactorial inheritance
Rationale: Multifactorial (or complex) inheritance describes diseases or traits that result from
the interaction of multiple genetic factors (polygenic) and environmental influences. The
expression of the trait is often conditional on these environmental triggers.
Question 8
Which of the following is a characteristic of malignant tumor cells?
A) Well-differentiated and slow-growing.
B) Encapsulated and non-invasive.
C) Loss of contact inhibition and uncontrolled proliferation.
D) Do not metastasize.
E) Show orderly cell arrangement.
Correct Answer: C) Loss of contact inhibition and uncontrolled proliferation.
Rationale: Malignant cells lose normal growth controls, including contact inhibition (cessation of
growth upon contact with other cells), leading to uncontrolled and often rapid proliferation.
They are also typically poorly differentiated, invasive, and capable of metastasis.
Question 9
What is the role of tumor suppressor genes in normal cellular function?
A) To promote cell division and growth.
B) To repair DNA damage.
C) To regulate cell cycle progression and inhibit uncontrolled cell growth.
D) To initiate apoptosis in all cells.
E) To enhance angiogenesis.
Correct Answer: C) To regulate cell cycle progression and inhibit uncontrolled cell growth.
Rationale: Tumor suppressor genes (e.g., p53, BRCA1/2) act as "brakes" on cell proliferation.
, They monitor cell cycle progression, initiate DNA repair, and trigger apoptosis if DNA damage is
irreparable, thereby preventing uncontrolled cell growth and tumor formation.
Question 10
A patient with severe diarrhea is experiencing a fluid and electrolyte imbalance. Which type of
fluid imbalance is most likely to occur?
A) Hypervolemia
B) Isotonic fluid excess
C) Hypovolemia
D) Hypernatremia
E) Hypokalemia
Correct Answer: C) Hypovolemia
Rationale: Severe diarrhea causes significant loss of both water and electrolytes (primarily
sodium and potassium) from the extracellular fluid. This isotonic fluid loss leads to a decrease in
the overall extracellular fluid volume, resulting in hypovolemia. Hypokalemia is also very likely
but hypovolemia describes the overall fluid status.
Question 11
Which electrolyte imbalance is most commonly associated with impaired cardiac conduction
and dysrhythmias, including peaked T waves on an ECG?
A) Hyponatremia
B) Hyperkalemia
C) Hypocalcemia
D) Hypermagnesemia
E) Hypophosphatemia
Correct Answer: B) Hyperkalemia
Rationale: Hyperkalemia (elevated serum potassium) significantly impacts cardiac
electrophysiology, leading to a shortened repolarization phase, which manifests as tall, peaked T
waves on an ECG. Severe hyperkalemia can progress to life-threatening dysrhythmias like
ventricular fibrillation or asystole.
Question 12
A patient with chronic kidney disease is at risk for which acid-base imbalance due to impaired
hydrogen ion excretion and bicarbonate reabsorption?
A) Metabolic acidosis
B) Respiratory acidosis
C) Metabolic alkalosis
D) Respiratory alkalosis
E) Mixed acid-base disorder
MIDTERM EXAM LATEST
Question 1
Which cellular adaptation is characterized by an increase in the number of cells in an organ or
tissue?
A) Hypertrophy
B) Atrophy
C) Hyperplasia
D) Metaplasia
E) Dysplasia
Correct Answer: C) Hyperplasia
Rationale: Hyperplasia refers to an increase in the absolute number of cells within an organ or
tissue, often in response to increased demand, hormonal stimulation, or compensatory
mechanisms. Hypertrophy is an increase in cell size, atrophy is a decrease in cell size/number,
metaplasia is a change in cell type, and dysplasia is deranged cellular growth.
Question 2
A patient with prolonged ischemia to myocardial tissue develops cellular injury. Which cellular
change is irreversible and indicates cell death?
A) Swelling of the endoplasmic reticulum
B) Accumulation of intracellular lipids
C) Mitochondrial calcification
D) Nuclear condensation (pyknosis)
E) Detachment of ribosomes
Correct Answer: D) Nuclear condensation (pyknosis)
Rationale: Irreversible cell injury leading to cell death is characterized by distinctive nuclear
changes. Pyknosis (nuclear condensation), karyorrhexis (nuclear fragmentation), and karyolysis
(nuclear dissolution) are definitive signs of irreversible cell injury and necrosis. The other
options represent reversible cellular changes.
Question 3
The inflammatory response is initiated by several cellular components. Which cell is the primary
initiator of the immediate hypersensitivity (Type I) allergic reaction?
A) Neutrophil
B) Macrophage
C) Mast cell
D) Lymphocyte
E) Eosinophil
Correct Answer: C) Mast cell
Rationale: Mast cells are critical effector cells in Type I (immediate) hypersensitivity reactions.
,Upon re-exposure to an allergen, IgE antibodies bound to mast cell surfaces cross-link,
triggering degranulation and the rapid release of histamine and other inflammatory mediators,
leading to allergic symptoms.
Question 4
A patient presents with signs of systemic inflammation, including fever and increased white
blood cell count. Which inflammatory mediator is primarily responsible for inducing fever?
A) Histamine
B) Prostaglandins
C) Leukotrienes
D) Bradykinin
E) Serotonin
Correct Answer: B) Prostaglandins
Rationale: Prostaglandins, particularly prostaglandin E2 (PGE2), are key mediators in fever
production. They are synthesized at the site of inflammation and act on the thermoregulatory
center in the hypothalamus, raising the body's set point for temperature.
Question 5
What is the primary mechanism by which nonsteroidal anti-inflammatory drugs (NSAIDs) reduce
inflammation and pain?
A) Blocking histamine receptors
B) Inhibiting cyclooxygenase (COX) enzymes
C) Suppressing lymphocyte proliferation
D) Enhancing phagocytic activity
E) Increasing cytokine production
Correct Answer: B) Inhibiting cyclooxygenase (COX) enzymes
Rationale: NSAIDs exert their anti-inflammatory, analgesic, and antipyretic effects by inhibiting
the cyclooxygenase (COX) enzymes (COX-1 and COX-2). COX enzymes are responsible for
synthesizing prostaglandins and thromboxanes, which are central to inflammation, pain, and
fever pathways.
Question 6
Which type of immunity involves the direct production of antibodies by the individual's own
immune system in response to exposure to a pathogen?
A) Passive natural immunity
B) Active natural immunity
C) Passive artificial immunity
D) Active artificial immunity
E) Innate immunity
,Correct Answer: B) Active natural immunity
Rationale: Active natural immunity occurs when an individual's immune system encounters a
pathogen (e.g., through infection) and mounts its own immune response, including the
production of antibodies and memory cells.
Question 7
A patient with a genetic predisposition to a certain disease exhibits the condition only if
exposed to specific environmental triggers. This phenomenon is known as:
A) Penetrance
B) Expressivity
C) Multifactorial inheritance
D) Epigenetics
E) Pleiotropy
Correct Answer: C) Multifactorial inheritance
Rationale: Multifactorial (or complex) inheritance describes diseases or traits that result from
the interaction of multiple genetic factors (polygenic) and environmental influences. The
expression of the trait is often conditional on these environmental triggers.
Question 8
Which of the following is a characteristic of malignant tumor cells?
A) Well-differentiated and slow-growing.
B) Encapsulated and non-invasive.
C) Loss of contact inhibition and uncontrolled proliferation.
D) Do not metastasize.
E) Show orderly cell arrangement.
Correct Answer: C) Loss of contact inhibition and uncontrolled proliferation.
Rationale: Malignant cells lose normal growth controls, including contact inhibition (cessation of
growth upon contact with other cells), leading to uncontrolled and often rapid proliferation.
They are also typically poorly differentiated, invasive, and capable of metastasis.
Question 9
What is the role of tumor suppressor genes in normal cellular function?
A) To promote cell division and growth.
B) To repair DNA damage.
C) To regulate cell cycle progression and inhibit uncontrolled cell growth.
D) To initiate apoptosis in all cells.
E) To enhance angiogenesis.
Correct Answer: C) To regulate cell cycle progression and inhibit uncontrolled cell growth.
Rationale: Tumor suppressor genes (e.g., p53, BRCA1/2) act as "brakes" on cell proliferation.
, They monitor cell cycle progression, initiate DNA repair, and trigger apoptosis if DNA damage is
irreparable, thereby preventing uncontrolled cell growth and tumor formation.
Question 10
A patient with severe diarrhea is experiencing a fluid and electrolyte imbalance. Which type of
fluid imbalance is most likely to occur?
A) Hypervolemia
B) Isotonic fluid excess
C) Hypovolemia
D) Hypernatremia
E) Hypokalemia
Correct Answer: C) Hypovolemia
Rationale: Severe diarrhea causes significant loss of both water and electrolytes (primarily
sodium and potassium) from the extracellular fluid. This isotonic fluid loss leads to a decrease in
the overall extracellular fluid volume, resulting in hypovolemia. Hypokalemia is also very likely
but hypovolemia describes the overall fluid status.
Question 11
Which electrolyte imbalance is most commonly associated with impaired cardiac conduction
and dysrhythmias, including peaked T waves on an ECG?
A) Hyponatremia
B) Hyperkalemia
C) Hypocalcemia
D) Hypermagnesemia
E) Hypophosphatemia
Correct Answer: B) Hyperkalemia
Rationale: Hyperkalemia (elevated serum potassium) significantly impacts cardiac
electrophysiology, leading to a shortened repolarization phase, which manifests as tall, peaked T
waves on an ECG. Severe hyperkalemia can progress to life-threatening dysrhythmias like
ventricular fibrillation or asystole.
Question 12
A patient with chronic kidney disease is at risk for which acid-base imbalance due to impaired
hydrogen ion excretion and bicarbonate reabsorption?
A) Metabolic acidosis
B) Respiratory acidosis
C) Metabolic alkalosis
D) Respiratory alkalosis
E) Mixed acid-base disorder
