NR283 Exam 2 Pathophysiology Study
Guide Week 3,4,5Questions And Well
Graded Solutions With Rationales
Updated 2026-2027
Ace your NR283 Pathophysiology Exam 2 with this ultimate 200-question study guide. Covers Weeks 3,
4, and 5 with detailed, step-by-step pathophysiological rationales. Perfect for mastering
fluid/electrolytes, respiratory disorders, elevated ICP (Cushing's Triad), cardiac perfusion
(MI/Troponin), shock, hematology (anemias, ALL/AML), and hepatic/renal failure. Tailored for
Chamberlain and top nursing schools to guarantee exam success. Download now to turn complex
concepts into easy A’s!
1. A patient presents with severe polyuria (12 L/day) and intense polydipsia following a
traumatic brain injury. The urine specific gravity is 1.002. Which mechanism explains
this condition?
A) Excessive secretion of antidiuretic hormone causing water retention.
B) Insufficient insulin production leading to osmotic diuresis from hyperglycemia.
C) Destruction of the posterior pituitary leading to a deficiency in antidiuretic
hormone.
D) Structural damage to the renal glomerulus causing massive protein loss.
C) Destruction of the posterior pituitary leading to a deficiency in antidiuretic
hormone.
Rationale: Traumatic brain injury can damage the hypothalamus or posterior pituitary
gland, arresting the synthesis or release of antidiuretic hormone (ADH), resulting in
Central Diabetes Insipidus. Without ADH, the aquaporin channels in the collecting
ducts of the kidneys remain closed, preventing water reabsorption. This leaves the
urine highly dilute (low specific gravity) and triggers profound systemic dehydration
and compensatory thirst.
2. A patient is admitted with a serum sodium level of 118 mHz/L. Which cellular shift
occurs in the brain tissue as a direct result of this electrolyte imbalance?
A) Water moves out of the intracellular space into the extracellular space, shrinking
brain cells.
B) Solutes pump rapidly out of the blood vessels, causing microvascular collapse.
C) Water moves from the hypotonic extracellular fluid into the hypertonic intracellular
space, swelling brain cells.
D) Sodium ions rush into the intracellular matrix, causing depolarization and cellular
lysis.
C) Water moves from the hypotonic extracellular fluid into the hypertonic
intracellular space, swelling brain cells.
Rationale: Severe hyponatremia renders the extracellular fluid highly hypotonic
relative to the intracellular environment of brain cells. Following the osmotic gradient,
water moves across the semi-permeable cell membranes into the cells to equalize
concentration. This intracellular fluid shift leads to cerebral edema, manifesting
clinically as confusion, seizures, and potential coma.
3. During an acute asthma attack, what is the primary pathophysiological event causing
the initial expiratory wheezing?
A) Irreversible destruction of the alveolar basement membranes.
B) Smooth muscle constriction, mucosal edema, and hypersecretion of thick mucus.
, C) Microvascular thrombosis within the pulmonary capillary network.
D) Paradoxical collapse of the upper trachea during the inspiratory phase.
B) Smooth muscle constriction, mucosal edema, and hypersecretion of thick
mucus.
Rationale: Asthma is an IgE-mediated hypersensitivity reaction. Exposure to an
allergen triggers mast cell degranulation, releasing histamine and leukotrienes.
These chemical mediators cause smooth muscle contraction (bronchospasm),
increase capillary permeability leading to mucosal edema, and stimulate goblet cells
to hypersecrete thick mucus, severely narrowing the airway lumen.
4. A patient with advanced emphysema exhibits a prominent barrel chest. Which
process directly underlies this anatomical alteration?
A) Hypertrophy of the intercostal muscles due to chronic non-productive coughing.
B) Fibrous scarring and contraction of the pleural membranes.
C) Loss of elastic recoil and premature airway closure leading to chronic air trapping.
D) Accumulation of purulent exudate within the lower pleural cavities.
C) Loss of elastic recoil and premature airway closure leading to chronic air
trapping.
Rationale: Cigarette smoke or alpha-1 antitrypsin deficiency increases protease
activity (like elastase), which destroys the elastic fibers within the alveolar walls. This
loss of elasticity removes the radial traction that keeps small airways open during
expiration. Consequently, bronchioles collapse prematurely during exhalation,
trapping air in the alveoli, expanding the residual volume, and widening the anterior-
posterior chest diameter.
5. A patient with chronic bronchitis presents with cyanosis and peripheral edema. What
is the step-by-step mechanism linking this pulmonary disease to right-sided heart
failure?
A) Left ventricular hypertrophy \(\rightarrow \) pulmonary congestion \(\rightarrow \)
systemic hypotension \(\rightarrow \) renal failure.
B) Alveolar hypoxia \(\rightarrow \) pulmonary vasoconstriction \(\rightarrow \)
pulmonary hypertension \(\rightarrow \) right ventricular strain.
C) Bronchial scarring \(\rightarrow \) aortic valve stenosis \(\rightarrow \) decreased
cardiac output \(\rightarrow \) peripheral pooling.
D) Mucus plugging \(\rightarrow \) respiratory alkalosis \(\rightarrow \) coronary artery
vasospasm \(\rightarrow \) myocardial infarction.
B) Alveolar hypoxia \(\rightarrow \) pulmonary vasoconstriction \(\rightarrow \)
pulmonary hypertension \(\rightarrow \) right ventricular strain.
Rationale: Chronic bronchitis causes widespread mucus plugging and airway
obstruction, leading to localized alveolar hypoxia. In the lungs, hypoxia triggers a
unique physiological response: pulmonary vasoconstriction (to shunt blood to better-
ventilated areas). When this vasoconstriction becomes chronic and widespread, it
elevates pulmonary vascular resistance (pulmonary hypertension), forcing the right
ventricle to pump against higher pressures, eventually causing hypertrophy and
failure (Cor Pulmonale).
6. A patient is admitted with a massive deep vein thrombosis (DVT) in the right lower
extremity. Two hours later, they develop sudden-onset pleuritic chest pain and
dyspnea. What is the immediate consequence on pulmonary ventilation and
perfusion?
A) An increase in ventilation with an identical increase in perfusion, keeping the ratio
stable.
B) A decrease in ventilation with normal perfusion, causing an intrapulmonary shunt.
, C) Normal ventilation accompanied by an arrest of perfusion, creating alveolar dead
space.
D) Complete collapse of the visceral pleura due to an accumulation of atmospheric
air.
C) Normal ventilation accompanied by an arrest of perfusion, creating alveolar
dead space.
Rationale: A pulmonary embolism occurs when a thrombus dislodges from the deep
veins, travels through the vena cava and right heart, and occludes a branch of the
pulmonary arterial bed. This stops blood flow to the downstream alveoli (loss of
perfusion), while air continue to enter the alveoli normally (intact ventilation). This
mismatch creates alveolar dead space, preventing gas exchange.
7. Which acid-base imbalance will a patient initially develop during the early stages of
an acute asthma attack or hyperventilation due to anxiety?
A) Respiratory acidosis due to severe alveolar hypoventilation.
B) Metabolic acidosis due to excessive accumulation of lactic acid.
C) Respiratory alkalosis due to excessive exhalation of carbon dioxide.
D) Metabolic alkalosis due to severe renal bicarbonate retention.
C) Respiratory alkalosis due to excessive exhalation of carbon dioxide.
Rationale: During hyperventilation or the early, anxious phase of an asthma attack,
the respiratory rate and depth increase. This causes excessive clearing or "blowing
off" of carbon dioxide (\(CO_{2}\)). Because \(CO_{2}\) acts as an acid in the blood
(forming carbonic acid), its depletion lowers the hydrogen ion concentration, driving
the blood pH upward into respiratory alkalosis.
8. A patient with severe left-sided heart failure develops acute pulmonary edema. What
is the primary fluid dynamic abnormality forcing fluid into the alveoli?
A) Decreased capillary oncotic pressure due to hepatic synthetic failure.
B) Increased capillary permeability from an acute localized inflammatory response.
C) Increased capillary hydrostatic pressure backing up from the left atrium.
D) Lymphatic obstruction preventing the drainage of normal interstitial fluid.
C) Increased capillary hydrostatic pressure backing up from the left atrium.
Rationale: When the left ventricle fails as a pump, it cannot efficiently eject blood
forward. Blood backs up into the left atrium and into the pulmonary veins and
capillaries. This backward pressure increases pulmonary capillary hydrostatic
pressure, overcoming the opposing oncotic pressure and forcing water out of the
capillaries, across the alveolar-capillary membrane, and into the air spaces.
9. A patient presents with a serum potassium level of 6.8 mEq/L. Which
electrocardiogram (ECG) change is most characteristically associated with this
specific electrolyte abnormality?
A) Prolonged QT interval and prominent U waves.
B) Tall, tented or peaked T waves and widening of the QRS complex.
C) Severe ST-segment elevation across all precordial leads.
D) Disappearance of the QRS complex with an isolated, inverted P wave.
B) Tall, tented or peaked T waves and widening of the QRS complex.
Rationale: Hyperkalemia alters the resting membrane potential of myocardial cells,
making them hypopolarized. This accelerates the repolarization phase, which
manifests on an ECG as tall, narrow, peaked T waves. As potassium levels continue
to rise, depolarization slows down, widening the QRS complex and increasing the
risk of lethal arrhythmias.
10. A patient has a serum calcium level of 6.2 mg/dL. Which clinical sign should the
nurse assess for to confirm neuromuscular irritability?
, A) Kernig’s sign when flexing the patient's hip and knee.
B) Chvostek’s sign by tapping the facial nerve anterior to the earlobe.
C) Babinski's reflex by stroking the lateral plantar surface of the foot.
D) Homans' sign by dorsiflexing the foot to elicit calf pain.
B) Chvostek’s sign by tapping the facial nerve anterior to the earlobe.
Rationale: Hypocalcemia increases neuromuscular excitability because calcium ions
normally stabilize voltage-gated sodium channels. When extracellular calcium levels
drop, sodium channels open more easily, lowering the threshold for depolarization.
Tapping the facial nerve triggers rapid, involuntary twitching of the ipsilateral facial
muscles (Chvostek's sign).
11. What is the primary physiological function of the Renin-Angiotensin-Aldosterone
System (RAAS) when activated by a drop in systemic blood pressure?
A) To lower peripheral vascular resistance and excrete excess sodium via the
kidneys.
B) To induce widespread vasodilation and enhance the excretion of water.
C) To cause vasoconstriction and promote renal sodium and water retention to
restore volume.
D) To depress the cardiac conduction system and minimize myocardial oxygen
demand.
C) To cause vasoconstriction and promote renal sodium and water retention to
restore volume.
Rationale: A drop in blood pressure or renal perfusion prompts the juxtaglomerular
apparatus in the kidneys to secrete renin. Renin converts angiotensinogen to
angiotensin I, which is cleaved by Angiotensin-Converting Enzyme (ACE) into
angiotensin II. Angiotensin II is a potent vasoconstrictor that also stimulates the
adrenal cortex to release aldosterone, increasing renal sodium and water
reabsorption.
12. A patient with end-stage renal disease presents with a serum magnesium level of 3.8
mEq/L. Which assessment finding is consistent with this high level?
A) Hyperreflexia, muscle tremors, and tetany.
B) Diminished or absent deep tendon reflexes and respiratory depression.
C) Sustained supraventricular tachycardia and hypertension.
D) Severe generalized pruritus and structural bone pain.
B) Diminished or absent deep tendon reflexes and respiratory depression.
Rationale: Hypermagnesemia depresses the central nervous system and
neuromuscular junction by blocking acetylcholine release at the motor endplate and
inhibiting calcium channels. This manifests clinically as hyporeflexia (diminished
deep tendon reflexes), muscle weakness, bradycardia, hypotension, and, in severe
cases, flaccid paralysis and respiratory depression.
13. How does the body compensate for a state of chronic respiratory acidosis in a
patient with long-standing, severe COPD?
A) The lungs increase the respiratory rate to blow off metabolic organic acids.
B) The kidneys excrete hydrogen ions and reabsorb and synthesize bicarbonate
ions.
C) The liver metabolizes lactic acid into carbon dioxide and water for excretion.
D) Intracellular proteins shift out of the cells to neutralize circulating bases.
B) The kidneys excrete hydrogen ions and reabsorb and synthesize
bicarbonate ions.
Rationale: Chronic respiratory acidosis features a persistent retention of \(CO_{2}\)
Guide Week 3,4,5Questions And Well
Graded Solutions With Rationales
Updated 2026-2027
Ace your NR283 Pathophysiology Exam 2 with this ultimate 200-question study guide. Covers Weeks 3,
4, and 5 with detailed, step-by-step pathophysiological rationales. Perfect for mastering
fluid/electrolytes, respiratory disorders, elevated ICP (Cushing's Triad), cardiac perfusion
(MI/Troponin), shock, hematology (anemias, ALL/AML), and hepatic/renal failure. Tailored for
Chamberlain and top nursing schools to guarantee exam success. Download now to turn complex
concepts into easy A’s!
1. A patient presents with severe polyuria (12 L/day) and intense polydipsia following a
traumatic brain injury. The urine specific gravity is 1.002. Which mechanism explains
this condition?
A) Excessive secretion of antidiuretic hormone causing water retention.
B) Insufficient insulin production leading to osmotic diuresis from hyperglycemia.
C) Destruction of the posterior pituitary leading to a deficiency in antidiuretic
hormone.
D) Structural damage to the renal glomerulus causing massive protein loss.
C) Destruction of the posterior pituitary leading to a deficiency in antidiuretic
hormone.
Rationale: Traumatic brain injury can damage the hypothalamus or posterior pituitary
gland, arresting the synthesis or release of antidiuretic hormone (ADH), resulting in
Central Diabetes Insipidus. Without ADH, the aquaporin channels in the collecting
ducts of the kidneys remain closed, preventing water reabsorption. This leaves the
urine highly dilute (low specific gravity) and triggers profound systemic dehydration
and compensatory thirst.
2. A patient is admitted with a serum sodium level of 118 mHz/L. Which cellular shift
occurs in the brain tissue as a direct result of this electrolyte imbalance?
A) Water moves out of the intracellular space into the extracellular space, shrinking
brain cells.
B) Solutes pump rapidly out of the blood vessels, causing microvascular collapse.
C) Water moves from the hypotonic extracellular fluid into the hypertonic intracellular
space, swelling brain cells.
D) Sodium ions rush into the intracellular matrix, causing depolarization and cellular
lysis.
C) Water moves from the hypotonic extracellular fluid into the hypertonic
intracellular space, swelling brain cells.
Rationale: Severe hyponatremia renders the extracellular fluid highly hypotonic
relative to the intracellular environment of brain cells. Following the osmotic gradient,
water moves across the semi-permeable cell membranes into the cells to equalize
concentration. This intracellular fluid shift leads to cerebral edema, manifesting
clinically as confusion, seizures, and potential coma.
3. During an acute asthma attack, what is the primary pathophysiological event causing
the initial expiratory wheezing?
A) Irreversible destruction of the alveolar basement membranes.
B) Smooth muscle constriction, mucosal edema, and hypersecretion of thick mucus.
, C) Microvascular thrombosis within the pulmonary capillary network.
D) Paradoxical collapse of the upper trachea during the inspiratory phase.
B) Smooth muscle constriction, mucosal edema, and hypersecretion of thick
mucus.
Rationale: Asthma is an IgE-mediated hypersensitivity reaction. Exposure to an
allergen triggers mast cell degranulation, releasing histamine and leukotrienes.
These chemical mediators cause smooth muscle contraction (bronchospasm),
increase capillary permeability leading to mucosal edema, and stimulate goblet cells
to hypersecrete thick mucus, severely narrowing the airway lumen.
4. A patient with advanced emphysema exhibits a prominent barrel chest. Which
process directly underlies this anatomical alteration?
A) Hypertrophy of the intercostal muscles due to chronic non-productive coughing.
B) Fibrous scarring and contraction of the pleural membranes.
C) Loss of elastic recoil and premature airway closure leading to chronic air trapping.
D) Accumulation of purulent exudate within the lower pleural cavities.
C) Loss of elastic recoil and premature airway closure leading to chronic air
trapping.
Rationale: Cigarette smoke or alpha-1 antitrypsin deficiency increases protease
activity (like elastase), which destroys the elastic fibers within the alveolar walls. This
loss of elasticity removes the radial traction that keeps small airways open during
expiration. Consequently, bronchioles collapse prematurely during exhalation,
trapping air in the alveoli, expanding the residual volume, and widening the anterior-
posterior chest diameter.
5. A patient with chronic bronchitis presents with cyanosis and peripheral edema. What
is the step-by-step mechanism linking this pulmonary disease to right-sided heart
failure?
A) Left ventricular hypertrophy \(\rightarrow \) pulmonary congestion \(\rightarrow \)
systemic hypotension \(\rightarrow \) renal failure.
B) Alveolar hypoxia \(\rightarrow \) pulmonary vasoconstriction \(\rightarrow \)
pulmonary hypertension \(\rightarrow \) right ventricular strain.
C) Bronchial scarring \(\rightarrow \) aortic valve stenosis \(\rightarrow \) decreased
cardiac output \(\rightarrow \) peripheral pooling.
D) Mucus plugging \(\rightarrow \) respiratory alkalosis \(\rightarrow \) coronary artery
vasospasm \(\rightarrow \) myocardial infarction.
B) Alveolar hypoxia \(\rightarrow \) pulmonary vasoconstriction \(\rightarrow \)
pulmonary hypertension \(\rightarrow \) right ventricular strain.
Rationale: Chronic bronchitis causes widespread mucus plugging and airway
obstruction, leading to localized alveolar hypoxia. In the lungs, hypoxia triggers a
unique physiological response: pulmonary vasoconstriction (to shunt blood to better-
ventilated areas). When this vasoconstriction becomes chronic and widespread, it
elevates pulmonary vascular resistance (pulmonary hypertension), forcing the right
ventricle to pump against higher pressures, eventually causing hypertrophy and
failure (Cor Pulmonale).
6. A patient is admitted with a massive deep vein thrombosis (DVT) in the right lower
extremity. Two hours later, they develop sudden-onset pleuritic chest pain and
dyspnea. What is the immediate consequence on pulmonary ventilation and
perfusion?
A) An increase in ventilation with an identical increase in perfusion, keeping the ratio
stable.
B) A decrease in ventilation with normal perfusion, causing an intrapulmonary shunt.
, C) Normal ventilation accompanied by an arrest of perfusion, creating alveolar dead
space.
D) Complete collapse of the visceral pleura due to an accumulation of atmospheric
air.
C) Normal ventilation accompanied by an arrest of perfusion, creating alveolar
dead space.
Rationale: A pulmonary embolism occurs when a thrombus dislodges from the deep
veins, travels through the vena cava and right heart, and occludes a branch of the
pulmonary arterial bed. This stops blood flow to the downstream alveoli (loss of
perfusion), while air continue to enter the alveoli normally (intact ventilation). This
mismatch creates alveolar dead space, preventing gas exchange.
7. Which acid-base imbalance will a patient initially develop during the early stages of
an acute asthma attack or hyperventilation due to anxiety?
A) Respiratory acidosis due to severe alveolar hypoventilation.
B) Metabolic acidosis due to excessive accumulation of lactic acid.
C) Respiratory alkalosis due to excessive exhalation of carbon dioxide.
D) Metabolic alkalosis due to severe renal bicarbonate retention.
C) Respiratory alkalosis due to excessive exhalation of carbon dioxide.
Rationale: During hyperventilation or the early, anxious phase of an asthma attack,
the respiratory rate and depth increase. This causes excessive clearing or "blowing
off" of carbon dioxide (\(CO_{2}\)). Because \(CO_{2}\) acts as an acid in the blood
(forming carbonic acid), its depletion lowers the hydrogen ion concentration, driving
the blood pH upward into respiratory alkalosis.
8. A patient with severe left-sided heart failure develops acute pulmonary edema. What
is the primary fluid dynamic abnormality forcing fluid into the alveoli?
A) Decreased capillary oncotic pressure due to hepatic synthetic failure.
B) Increased capillary permeability from an acute localized inflammatory response.
C) Increased capillary hydrostatic pressure backing up from the left atrium.
D) Lymphatic obstruction preventing the drainage of normal interstitial fluid.
C) Increased capillary hydrostatic pressure backing up from the left atrium.
Rationale: When the left ventricle fails as a pump, it cannot efficiently eject blood
forward. Blood backs up into the left atrium and into the pulmonary veins and
capillaries. This backward pressure increases pulmonary capillary hydrostatic
pressure, overcoming the opposing oncotic pressure and forcing water out of the
capillaries, across the alveolar-capillary membrane, and into the air spaces.
9. A patient presents with a serum potassium level of 6.8 mEq/L. Which
electrocardiogram (ECG) change is most characteristically associated with this
specific electrolyte abnormality?
A) Prolonged QT interval and prominent U waves.
B) Tall, tented or peaked T waves and widening of the QRS complex.
C) Severe ST-segment elevation across all precordial leads.
D) Disappearance of the QRS complex with an isolated, inverted P wave.
B) Tall, tented or peaked T waves and widening of the QRS complex.
Rationale: Hyperkalemia alters the resting membrane potential of myocardial cells,
making them hypopolarized. This accelerates the repolarization phase, which
manifests on an ECG as tall, narrow, peaked T waves. As potassium levels continue
to rise, depolarization slows down, widening the QRS complex and increasing the
risk of lethal arrhythmias.
10. A patient has a serum calcium level of 6.2 mg/dL. Which clinical sign should the
nurse assess for to confirm neuromuscular irritability?
, A) Kernig’s sign when flexing the patient's hip and knee.
B) Chvostek’s sign by tapping the facial nerve anterior to the earlobe.
C) Babinski's reflex by stroking the lateral plantar surface of the foot.
D) Homans' sign by dorsiflexing the foot to elicit calf pain.
B) Chvostek’s sign by tapping the facial nerve anterior to the earlobe.
Rationale: Hypocalcemia increases neuromuscular excitability because calcium ions
normally stabilize voltage-gated sodium channels. When extracellular calcium levels
drop, sodium channels open more easily, lowering the threshold for depolarization.
Tapping the facial nerve triggers rapid, involuntary twitching of the ipsilateral facial
muscles (Chvostek's sign).
11. What is the primary physiological function of the Renin-Angiotensin-Aldosterone
System (RAAS) when activated by a drop in systemic blood pressure?
A) To lower peripheral vascular resistance and excrete excess sodium via the
kidneys.
B) To induce widespread vasodilation and enhance the excretion of water.
C) To cause vasoconstriction and promote renal sodium and water retention to
restore volume.
D) To depress the cardiac conduction system and minimize myocardial oxygen
demand.
C) To cause vasoconstriction and promote renal sodium and water retention to
restore volume.
Rationale: A drop in blood pressure or renal perfusion prompts the juxtaglomerular
apparatus in the kidneys to secrete renin. Renin converts angiotensinogen to
angiotensin I, which is cleaved by Angiotensin-Converting Enzyme (ACE) into
angiotensin II. Angiotensin II is a potent vasoconstrictor that also stimulates the
adrenal cortex to release aldosterone, increasing renal sodium and water
reabsorption.
12. A patient with end-stage renal disease presents with a serum magnesium level of 3.8
mEq/L. Which assessment finding is consistent with this high level?
A) Hyperreflexia, muscle tremors, and tetany.
B) Diminished or absent deep tendon reflexes and respiratory depression.
C) Sustained supraventricular tachycardia and hypertension.
D) Severe generalized pruritus and structural bone pain.
B) Diminished or absent deep tendon reflexes and respiratory depression.
Rationale: Hypermagnesemia depresses the central nervous system and
neuromuscular junction by blocking acetylcholine release at the motor endplate and
inhibiting calcium channels. This manifests clinically as hyporeflexia (diminished
deep tendon reflexes), muscle weakness, bradycardia, hypotension, and, in severe
cases, flaccid paralysis and respiratory depression.
13. How does the body compensate for a state of chronic respiratory acidosis in a
patient with long-standing, severe COPD?
A) The lungs increase the respiratory rate to blow off metabolic organic acids.
B) The kidneys excrete hydrogen ions and reabsorb and synthesize bicarbonate
ions.
C) The liver metabolizes lactic acid into carbon dioxide and water for excretion.
D) Intracellular proteins shift out of the cells to neutralize circulating bases.
B) The kidneys excrete hydrogen ions and reabsorb and synthesize
bicarbonate ions.
Rationale: Chronic respiratory acidosis features a persistent retention of \(CO_{2}\)
