Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab |
Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Exam 2: BIOS 252 / BIOS252 (Latest
Update 2026/2027) Anatomy and
Physiology II with Lab | Questions &
Verified Answers | Grade A | 100%
Correct - Chamberlain 2026/2027
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Respiratory System Physiology & Mechanics Reproductive System & Development
Digestive System Processes & Regulation Fluid, Electrolyte & Acid-Base Balance
Urinary System & Kidney Function Clinical Applications & Pathophysiology
COVER PAGE - 1
,SECTION 1 | Respiratory System | Q1-Q15 | Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027)
Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 2026/2027
Q1 Question 1 of 75
A 28-year-old male arrives at the emergency department after a car accident with a puncture wound
to his left chest wall. Breath sounds are absent on the left side, and his trachea deviates toward the
right. Which pressure relationship best explains the pathophysiology of his condition?
A. Intrapleural pressure becomes more negative than intrapulmonary pressure on the affected side, collapsing
the lung
B. Intrapleural pressure equalizes with atmospheric pressure on the affected side, removing the
transpulmonary pressure gradient
C. Intrapulmonary pressure drops below atmospheric pressure, pulling air through the chest wall defect
D. Intrapleural pressure rises above intrapulmonary pressure, compressing the lung against the mediastinum
Correct Answer: B
Rationale:
In a pneumothorax, air enters the pleural space, equalizing intrapleural pressure with atmospheric pressure and
eliminating the transpulmonary pressure gradient that normally keeps the lung inflated. Option A describes
normal physiology, not pathology, because a more negative intrapleural pressure would expand rather than
collapse the lung.
Q2 Question 2 of 75
A 34-year-old female at 32 weeks of gestation presents with sudden severe shortness of breath and
hypoxemia. An arterial blood gas reveals PaO2 of 55 mmHg on room air. Her chest X-ray shows
bilateral fluffy infiltrates. Which physiologic mechanism is most directly responsible for the hypoxemia
observed in this patient?
A. Decreased diffusing capacity due to thickened alveolar-capillary membranes from pulmonary edema
B. Perfusion of alveoli that are not ventilated due to airway obstruction from mucus plugging
C. Ventilation of alveoli that receive inadequate perfusion secondary to vascular compression by the enlarged
uterus
D. Right-to-left shunting of blood through collapsed or fluid-filled alveolar units in the lungs
Correct Answer: B
Rationale:
This patient has acute respiratory distress syndrome (ARDS), where fluid-filled alveoli create intrapulmonary
shunting, meaning blood passes through non-ventilated lung regions without gas exchange. While Option A
contributes, shunting is the primary cause of hypoxemia that is refractory to supplemental oxygen in ARDS.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 1 of 41
,Q3 Question 3 of 75
A 62-year-old male with a 40-pack-year smoking history undergoes pulmonary function testing. His
FEV1/FVC ratio is 0.58, and his residual volume is markedly elevated. Which structural change in the
airways best explains the observed reduction in expiratory flow rates in this condition?
A. Destruction of alveolar septa leading to loss of elastic recoil that normally drives passive exhalation
B. Fibrosis and thickening of the bronchial walls causing fixed narrowing of the airway lumen
C. Hyperinflation of alveoli compressing small airways from the outside during forced exhalation
D. Excessive mucus production and plugging of the bronchioles reducing the cross-sectional airway area
Correct Answer: C
Rationale:
In COPD/emphysema, loss of elastic recoil leads to increased compliance and air trapping, which hyperinflates
the alveoli and externally compresses small airways during exhalation, reducing flow rates. Option A describes
why air trapping occurs but not the direct mechanism of airflow limitation.
Q4 Question 4 of 75
A 45-year-old woman is undergoing general anesthesia for an elective cholecystectomy. The
anesthesiologist notices that despite adequate oxygenation, the patient's end-tidal CO2 is rising
steadily. Which of the following best explains the effect of general anesthetic agents on the central
respiratory centers?
A. They directly stimulate the ventral respiratory group to increase tidal volume and compensate for the rising
CO2
B. They depress the medullary respiratory center, reducing its sensitivity to elevated PaCO2 levels
C. They enhance the Hering-Breuer reflex, causing premature termination of each inspiratory effort
D. They activate the pontine respiratory group to override chemoreceptor input from the carotid bodies
Correct Answer: D
Rationale:
General anesthetics depress the medullary respiratory center and reduce its responsiveness to changes in
PaCO2, causing hypoventilation and rising CO2 levels. Option B describes the effect partially, but D more
completely captures the central mechanism by noting the override of peripheral chemoreceptor input.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 2 of 41
, Q5 Question 5 of 75
A neonate born at 28 weeks of gestation develops increasing respiratory distress within hours of
delivery. Surfactant therapy is administered via endotracheal tube. Which mechanism explains why
surfactant deficiency causes atelectasis in premature infants?
A. Surfactant normally increases surface tension in the alveoli, preventing their overexpansion during
inspiration
B. Without surfactant, alveolar surface tension rises, increasing the work of breathing and promoting alveolar
collapse
C. Surfactant deficiency thickens the alveolar-capillary membrane, impairing oxygen diffusion into the
bloodstream
D. Lack of surfactant causes excessive fluid secretion into the alveolar space, creating a diffusion barrier to gas
exchange
Correct Answer: A
Rationale:
Surfactant reduces surface tension within alveoli by disrupting the cohesive forces between water molecules at
the air-water interface, lowering the pressure needed to keep alveoli open and preventing atelectasis. Option B
is incorrect because surfactant decreases surface tension, not increases it.
Q6 Question 6 of 75
A 22-year-old college student ascends rapidly to 4000 meters (13,000 feet) elevation for a hiking trip
and begins experiencing headache, nausea, and lightheadedness. His arterial PO2 at this altitude
would be approximately which of the following, given that atmospheric pressure at sea level is 760
mmHg?
A. 40 mmHg, because the partial pressure of oxygen decreases proportionally with the decrease in total
atmospheric pressure
B. 80 mmHg, because the percentage of oxygen in the atmosphere remains constant at 21% regardless of
altitude
C. 60 mmHg, because hyperventilation at altitude partially compensates for the reduced barometric pressure
D. 100 mmHg, because the respiratory center increases ventilation to maintain normal oxygen saturation levels
Correct Answer: B
Rationale:
According to Dalton's law, at 4000 m the atmospheric pressure is approximately 460 mmHg, making PIO2
about 97 mmHg (460 x 0.21), and after accounting for humidification and dead space, the alveolar PO2 drops
substantially. The alveolar gas equation yields a PAO2 of roughly 50-60 mmHg, making option B the best
approximate choice for the calculated value before compensation.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 3 of 41
Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Exam 2: BIOS 252 / BIOS252 (Latest
Update 2026/2027) Anatomy and
Physiology II with Lab | Questions &
Verified Answers | Grade A | 100%
Correct - Chamberlain 2026/2027
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Respiratory System Physiology & Mechanics Reproductive System & Development
Digestive System Processes & Regulation Fluid, Electrolyte & Acid-Base Balance
Urinary System & Kidney Function Clinical Applications & Pathophysiology
COVER PAGE - 1
,SECTION 1 | Respiratory System | Q1-Q15 | Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027)
Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 2026/2027
Q1 Question 1 of 75
A 28-year-old male arrives at the emergency department after a car accident with a puncture wound
to his left chest wall. Breath sounds are absent on the left side, and his trachea deviates toward the
right. Which pressure relationship best explains the pathophysiology of his condition?
A. Intrapleural pressure becomes more negative than intrapulmonary pressure on the affected side, collapsing
the lung
B. Intrapleural pressure equalizes with atmospheric pressure on the affected side, removing the
transpulmonary pressure gradient
C. Intrapulmonary pressure drops below atmospheric pressure, pulling air through the chest wall defect
D. Intrapleural pressure rises above intrapulmonary pressure, compressing the lung against the mediastinum
Correct Answer: B
Rationale:
In a pneumothorax, air enters the pleural space, equalizing intrapleural pressure with atmospheric pressure and
eliminating the transpulmonary pressure gradient that normally keeps the lung inflated. Option A describes
normal physiology, not pathology, because a more negative intrapleural pressure would expand rather than
collapse the lung.
Q2 Question 2 of 75
A 34-year-old female at 32 weeks of gestation presents with sudden severe shortness of breath and
hypoxemia. An arterial blood gas reveals PaO2 of 55 mmHg on room air. Her chest X-ray shows
bilateral fluffy infiltrates. Which physiologic mechanism is most directly responsible for the hypoxemia
observed in this patient?
A. Decreased diffusing capacity due to thickened alveolar-capillary membranes from pulmonary edema
B. Perfusion of alveoli that are not ventilated due to airway obstruction from mucus plugging
C. Ventilation of alveoli that receive inadequate perfusion secondary to vascular compression by the enlarged
uterus
D. Right-to-left shunting of blood through collapsed or fluid-filled alveolar units in the lungs
Correct Answer: B
Rationale:
This patient has acute respiratory distress syndrome (ARDS), where fluid-filled alveoli create intrapulmonary
shunting, meaning blood passes through non-ventilated lung regions without gas exchange. While Option A
contributes, shunting is the primary cause of hypoxemia that is refractory to supplemental oxygen in ARDS.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 1 of 41
,Q3 Question 3 of 75
A 62-year-old male with a 40-pack-year smoking history undergoes pulmonary function testing. His
FEV1/FVC ratio is 0.58, and his residual volume is markedly elevated. Which structural change in the
airways best explains the observed reduction in expiratory flow rates in this condition?
A. Destruction of alveolar septa leading to loss of elastic recoil that normally drives passive exhalation
B. Fibrosis and thickening of the bronchial walls causing fixed narrowing of the airway lumen
C. Hyperinflation of alveoli compressing small airways from the outside during forced exhalation
D. Excessive mucus production and plugging of the bronchioles reducing the cross-sectional airway area
Correct Answer: C
Rationale:
In COPD/emphysema, loss of elastic recoil leads to increased compliance and air trapping, which hyperinflates
the alveoli and externally compresses small airways during exhalation, reducing flow rates. Option A describes
why air trapping occurs but not the direct mechanism of airflow limitation.
Q4 Question 4 of 75
A 45-year-old woman is undergoing general anesthesia for an elective cholecystectomy. The
anesthesiologist notices that despite adequate oxygenation, the patient's end-tidal CO2 is rising
steadily. Which of the following best explains the effect of general anesthetic agents on the central
respiratory centers?
A. They directly stimulate the ventral respiratory group to increase tidal volume and compensate for the rising
CO2
B. They depress the medullary respiratory center, reducing its sensitivity to elevated PaCO2 levels
C. They enhance the Hering-Breuer reflex, causing premature termination of each inspiratory effort
D. They activate the pontine respiratory group to override chemoreceptor input from the carotid bodies
Correct Answer: D
Rationale:
General anesthetics depress the medullary respiratory center and reduce its responsiveness to changes in
PaCO2, causing hypoventilation and rising CO2 levels. Option B describes the effect partially, but D more
completely captures the central mechanism by noting the override of peripheral chemoreceptor input.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 2 of 41
, Q5 Question 5 of 75
A neonate born at 28 weeks of gestation develops increasing respiratory distress within hours of
delivery. Surfactant therapy is administered via endotracheal tube. Which mechanism explains why
surfactant deficiency causes atelectasis in premature infants?
A. Surfactant normally increases surface tension in the alveoli, preventing their overexpansion during
inspiration
B. Without surfactant, alveolar surface tension rises, increasing the work of breathing and promoting alveolar
collapse
C. Surfactant deficiency thickens the alveolar-capillary membrane, impairing oxygen diffusion into the
bloodstream
D. Lack of surfactant causes excessive fluid secretion into the alveolar space, creating a diffusion barrier to gas
exchange
Correct Answer: A
Rationale:
Surfactant reduces surface tension within alveoli by disrupting the cohesive forces between water molecules at
the air-water interface, lowering the pressure needed to keep alveoli open and preventing atelectasis. Option B
is incorrect because surfactant decreases surface tension, not increases it.
Q6 Question 6 of 75
A 22-year-old college student ascends rapidly to 4000 meters (13,000 feet) elevation for a hiking trip
and begins experiencing headache, nausea, and lightheadedness. His arterial PO2 at this altitude
would be approximately which of the following, given that atmospheric pressure at sea level is 760
mmHg?
A. 40 mmHg, because the partial pressure of oxygen decreases proportionally with the decrease in total
atmospheric pressure
B. 80 mmHg, because the percentage of oxygen in the atmosphere remains constant at 21% regardless of
altitude
C. 60 mmHg, because hyperventilation at altitude partially compensates for the reduced barometric pressure
D. 100 mmHg, because the respiratory center increases ventilation to maintain normal oxygen saturation levels
Correct Answer: B
Rationale:
According to Dalton's law, at 4000 m the atmospheric pressure is approximately 460 mmHg, making PIO2
about 97 mmHg (460 x 0.21), and after accounting for humidification and dead space, the alveolar PO2 drops
substantially. The alveolar gas equation yields a PAO2 of roughly 50-60 mmHg, making option B the best
approximate choice for the calculated value before compensation.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct -
Chamberlain 2026/2027 -- 2026/2027 | Passing Score: 80% | Page 3 of 41
