1
ATI Gas Exchange and Oxygenation Actual Exam
2026/2027 | Questions with Complete Solutions |
Comprehensive Focused Review Practice Exam | Pass
Guaranteed - A+ Graded
SECTION 1: RESPIRATORY ANATOMY & PHYSIOLOGY (5 Questions)
Q1: Which process refers to the movement of oxygen and carbon dioxide between the alveoli
and the pulmonary capillaries?
A. Ventilation
B. Diffusion
C. Perfusion
D. Oxygenation
Correct Answer: B. [CORRECT]
Rationale: Diffusion is the passive movement of gases (oxygen and carbon dioxide) across the
alveolar-capillary membrane down their concentration gradients, driven by partial pressure
differences between the alveoli and blood.
Q2: A nurse is reviewing the mechanics of breathing. Which muscle is the primary muscle of
inspiration?
A. Internal intercostal muscles
B. Diaphragm
C. Abdominal muscles
D. Sternocleidomastoid
Correct Answer: B. [CORRECT]
Rationale: The diaphragm is the primary muscle of inspiration; when it contracts, it flattens and
descends, increasing thoracic volume and creating negative intrathoracic pressure that draws air
into the lungs.
Q3: The amount of air that can be forcibly exhaled after a normal exhalation is called:
, 2
A. Tidal volume
B. Vital capacity
C. Expiratory reserve volume
D. Residual volume
Correct Answer: C. [CORRECT]
Rationale: Expiratory reserve volume (ERV) is the additional amount of air (approximately
1,000-1,200 mL in adults) that can be forcibly exhaled after a normal, passive exhalation.
Q4: Which physiological factor has the greatest impact on the oxygen-hemoglobin dissociation
curve shift to the right, facilitating oxygen release to tissues?
A. Decreased body temperature
B. Decreased 2,3-DPG levels
C. Increased PaCO2 and decreased pH
D. Decreased hydrogen ion concentration
Correct Answer: C. [CORRECT]
Rationale: Increased PaCO2 and decreased pH (Bohr effect) shift the oxyhemoglobin
dissociation curve to the right, reducing hemoglobin's affinity for oxygen and promoting oxygen
unloading to metabolically active tissues.
Q5: A patient has a ventilation-perfusion (V/Q) mismatch characterized by adequate ventilation
but inadequate perfusion. This describes:
A. Anatomical shunt
B. Physiological dead space
C. Intrapulmonary shunt
D. Hypercapnia
Correct Answer: B. [CORRECT]
Rationale: Physiological dead space occurs when alveoli are ventilated but not perfused (high
V/Q ratio), resulting in wasted ventilation that does not participate in gas exchange, as seen in
pulmonary embolism.
SECTION 2: OXYGEN DELIVERY DEVICES (6 Questions)
Q6: Which oxygen delivery device provides the highest concentration of oxygen (up to 90-
95%)?
ATI Gas Exchange and Oxygenation Actual Exam
2026/2027 | Questions with Complete Solutions |
Comprehensive Focused Review Practice Exam | Pass
Guaranteed - A+ Graded
SECTION 1: RESPIRATORY ANATOMY & PHYSIOLOGY (5 Questions)
Q1: Which process refers to the movement of oxygen and carbon dioxide between the alveoli
and the pulmonary capillaries?
A. Ventilation
B. Diffusion
C. Perfusion
D. Oxygenation
Correct Answer: B. [CORRECT]
Rationale: Diffusion is the passive movement of gases (oxygen and carbon dioxide) across the
alveolar-capillary membrane down their concentration gradients, driven by partial pressure
differences between the alveoli and blood.
Q2: A nurse is reviewing the mechanics of breathing. Which muscle is the primary muscle of
inspiration?
A. Internal intercostal muscles
B. Diaphragm
C. Abdominal muscles
D. Sternocleidomastoid
Correct Answer: B. [CORRECT]
Rationale: The diaphragm is the primary muscle of inspiration; when it contracts, it flattens and
descends, increasing thoracic volume and creating negative intrathoracic pressure that draws air
into the lungs.
Q3: The amount of air that can be forcibly exhaled after a normal exhalation is called:
, 2
A. Tidal volume
B. Vital capacity
C. Expiratory reserve volume
D. Residual volume
Correct Answer: C. [CORRECT]
Rationale: Expiratory reserve volume (ERV) is the additional amount of air (approximately
1,000-1,200 mL in adults) that can be forcibly exhaled after a normal, passive exhalation.
Q4: Which physiological factor has the greatest impact on the oxygen-hemoglobin dissociation
curve shift to the right, facilitating oxygen release to tissues?
A. Decreased body temperature
B. Decreased 2,3-DPG levels
C. Increased PaCO2 and decreased pH
D. Decreased hydrogen ion concentration
Correct Answer: C. [CORRECT]
Rationale: Increased PaCO2 and decreased pH (Bohr effect) shift the oxyhemoglobin
dissociation curve to the right, reducing hemoglobin's affinity for oxygen and promoting oxygen
unloading to metabolically active tissues.
Q5: A patient has a ventilation-perfusion (V/Q) mismatch characterized by adequate ventilation
but inadequate perfusion. This describes:
A. Anatomical shunt
B. Physiological dead space
C. Intrapulmonary shunt
D. Hypercapnia
Correct Answer: B. [CORRECT]
Rationale: Physiological dead space occurs when alveoli are ventilated but not perfused (high
V/Q ratio), resulting in wasted ventilation that does not participate in gas exchange, as seen in
pulmonary embolism.
SECTION 2: OXYGEN DELIVERY DEVICES (6 Questions)
Q6: Which oxygen delivery device provides the highest concentration of oxygen (up to 90-
95%)?
