Exam 2
Q1. A patient with end-stage Chronic Obstructive Pulmonary Disease (COPD) has an arterial blood gas (ABG) drawn
showing pH 7.28 and PaCO2 54 mm Hg. Which acid-base imbalance does the nurse identify?
(A) Metabolic Alkalosis
(B) Respiratory Alkalosis
(C) Respiratory Acidosis
(D) Metabolic Acidosis
Correct Answer: (C) Respiratory Acidosis
Rationale: In COPD, severe hypoventilation and airway obstruction result in retention of carbon dioxide (PaCO2 > 45 mm Hg) and a
decreased arterial pH (< 7.35), which produces respiratory acidosis. [Ref: PATHO 2 2.pdf (Passage 108); Exam 2 P&MS.pdf; (Passage
6)]
Q2. Which pathophysiological mechanism defines hypoventilation?
(A) Excessive clearance of alveolar carbon dioxide causing hypocapnia
(B) Delivery of air to alveoli is insufficient to provide O2 and remove CO2
(C) Impaired systemic tissue utilization of oxygen despite normal arterial PaO2
(D) Primary loss of alveolar elastic recoil leading to air trapping
Correct Answer: (B) Delivery of air to alveoli is insufficient to provide O2 and remove CO2
Rationale: Hypoventilation occurs when delivery of air to the alveoli is insufficient to meet metabolic needs, resulting in increased
PaCO2 (>45 mm Hg) and hypoxemia. [Ref: Exam 2 P&MS.pdf; (Passage 1); PATHO 2 2.pdf (Passage 108)]
Q3. A patient receiving IV morphine post-op exhibits a respiratory rate of 8 breaths/min. Which blood gas alteration is
expected?
(A) Increased PaCO2 (hypercapnia) and hypoxemia
(B) Decreased PaCO2 (hypocapnia) and respiratory alkalosis
(C) Increased PaO2 and decreased arterial bicarbonate
(D) Normal PaCO2 with histotoxic cellular hypoxia
Correct Answer: (A) Increased PaCO2 (hypercapnia) and hypoxemia
Rationale: Drugs such as morphine and barbiturates depress central respiratory drive, causing hypoventilation, which leads to PaCO2
elevation (>45 mm Hg) and hypoxemia as CO2 displaces O2. [Ref: Exam 2 P&MS.pdf; (Passage 1); Patho_MSurg II Exam 2 U3.pdf
(Passage 243)]
NSG 3850 Pathophysiology For Nurses II • Fall 2026 Exam 2 Page 1
, Q4. Hyperventilation leads to which specific arterial blood gas change?
(A) Hypercapnia (PaCO2 > 45 mm Hg)
(B) Hypocapnia (PaCO2 < 35 mm Hg)
(C) Increased serum lactic acid
(D) Decreased arterial pH with normal PaCO2
Correct Answer: (B) Hypocapnia (PaCO2 < 35 mm Hg)
Rationale: Hyperventilation represents an increase in air entering the alveoli beyond metabolic demand, leading to excessive excretion
of CO2 and hypocapnia (PaCO2 < 35 mm Hg). [Ref: Exam 2 P&MS.pdf; (Passage 1); PATHO 2 2.pdf (Passage 109)]
Q5. A patient presenting with rapid, deep respirations at 28 breaths/min following brainstem trauma is demonstrating
central neurogenic hyperventilation. What etiology triggers this response?
(A) Activation of peripheral alveolar stretch receptors
(B) Direct injury to central respiratory control centers in the brainstem
(C) Severe elevation of oxygen-carrying hemoglobin capacity
(D) Inhibition of carbonic anhydrase in renal tubules
Correct Answer: (B) Direct injury to central respiratory control centers in the brainstem
Rationale: Brainstem injury can cause central neurogenic hyperventilation, an abnormal breathing pattern characterized by deep, rapid
breathing (>= 25 bpm) due to direct neurological disruption. [Ref: PATHO 2 2.pdf (Passage 110)]
Q6. Which type of hypoxia is characterized by a decrease in arterial PaO2 despite a normal oxygen-carrying capacity
of the blood?
(A) Anemic hypoxia
(B) Circulatory hypoxia
(C) Hypoxic hypoxia
(D) Histotoxic hypoxia
Correct Answer: (C) Hypoxic hypoxia
Rationale: Hypoxic hypoxia occurs when PaO2 is decreased despite normal oxygen-carrying capacity. Causes include high altitude,
hypoventilation, and upper airway obstruction. [Ref: Exam 2 P&MS.pdf; (Passage 3); PATHO 2 2.pdf (Passage 111)]
Q7. A patient diagnosed with severe iron deficiency anemia displays pale mucosa and fatigue. Which type of hypoxia
is present?
(A) Anemic hypoxia
(B) Histotoxic hypoxia
(C) Hypoxic hypoxia
(D) Circulatory hypoxia
Correct Answer: (A) Anemic hypoxia
Rationale: Anemic hypoxia results from a reduction in the oxygen-carrying capacity of blood due to decreased hemoglobin
concentration, low RBC count, or nutrient deficiencies (iron, B12, folate). [Ref: Exam 2 P&MS.pdf; (Passage 3); Patho_MSurg II Exam 2
U3.pdf (Passage 245)]
NSG 3850 Pathophysiology For Nurses II • Fall 2026 Exam 2 Page 2
, Q8. A patient in cardiogenic shock has a severely decreased cardiac output. Normal hemoglobin levels are noted, but
peripheral tissue perfusion is poor. Which form of hypoxia does this represent?
(A) Histotoxic hypoxia
(B) Anemic hypoxia
(C) Hypoxic hypoxia
(D) Circulatory hypoxia
Correct Answer: (D) Circulatory hypoxia
Rationale: Circulatory hypoxia occurs when cardiac output is reduced so that tissue blood flow is impaired despite normal arterial
oxygen content and hemoglobin carrying capacity. [Ref: Exam 2 P&MS.pdf; (Passage 3); PATHO 2 2.pdf (Passage 112)]
Q9. Cyanide poisoning causes tissue hypoxia through which mechanism?
(A) Rupture of alveolar septa preventing diffusion
(B) Interference of a toxic substance preventing cellular utilization of available oxygen
(C) Severe destruction of hemoglobin molecules
(D) Massive pulmonary artery vasoconstriction
Correct Answer: (B) Interference of a toxic substance preventing cellular utilization of available oxygen
Rationale: Histotoxic hypoxia occurs when a toxic agent (such as cyanide) impairs the ability of peripheral body tissues to utilize
available oxygen delivered to them. [Ref: Exam 2 P&MS.pdf; (Passage 3); PATHO 2 2.pdf (Passage 112)]
Q10. What is the hallmark diagnostic clinical manifestation of acute bronchitis?
(A) Inspiration friction rub
(B) Recent onset of cough
(C) Pertaining purulent sputum for > 2 years
(D) Apical lung cavitation on radiograph
Correct Answer: (B) Recent onset of cough
Rationale: The distinct hallmark clinical manifestation of acute bronchitis is a recent onset of cough (productive or nonproductive). [Ref:
Exam 2 P&MS.pdf; (Passage 4); PATHO 2 2.pdf (Passage 113, 115)]
Q11. Which diagnostic test definitively distinguishes acute bronchitis from pneumonia?
(A) Sputum Gram stain
(B) Arterial blood gas
(C) Chest radiograph
(D) Pulmonary function test
Correct Answer: (C) Chest radiograph
Rationale: A chest radiograph distinguishes acute bronchitis (which shows clear/normal lung fields) from pneumonia (which shows
parenchymal infiltrates/consolidation). [Ref: Exam 2 P&MS.pdf; (Passage 4); PATHO 2 2.pdf (Passage 115); Patho_MSurg II Exam 2
U3.pdf (Passage 248)]
NSG 3850 Pathophysiology For Nurses II • Fall 2026 Exam 2 Page 3