ATI Oxygenation Comprehensive Nursing Study Guide: Complete
Review of Airway Management, Respiratory Assessment, Oxygen
Therapy, Gas Exchange, and Evidence-Based Nursing Interventions for
Clinical Practice, Exam Preparation, and Patient Care Success
1. A nurse is explaining the physiology of gas exchange to a client. Which
structure is the primary site of oxygen and carbon dioxide exchange?
• A) Trachea
• B) Bronchioles
• C) Alveoli
• D) Pleura
Correct Answer: C) Alveoli
Rationale: The alveoli are the tiny, grape-like air sacs surrounded by
pulmonary capillaries where the actual exchange of gases (oxygen and
carbon dioxide) occurs via diffusion. The trachea and bronchioles are
conducting airways, and the pleura is the membrane surrounding the lungs.
2. A nurse is teaching about ventilation. Which statement correctly describes
this process?
• A) The movement of blood through the pulmonary capillaries
• B) The exchange of oxygen and carbon dioxide at the cellular level
• C) The mechanical movement of air into and out of the lungs
• D) The binding of oxygen to hemoglobin molecules
Correct Answer: C) The mechanical movement of air into and out of the
lungs
Rationale: Ventilation is the physical act of breathing (inspiration and
expiration). Perfusion (A) is blood flow. Diffusion (B) is gas exchange at the
alveolar-capillary membrane. Oxygen transport (D) involves hemoglobin.
3. A nurse is assessing a client's respiratory status. Which artery is most
commonly used to obtain an arterial blood gas (ABG) sample?
• A) Brachial artery
, • B) Femoral artery
• C) Radial artery
• D) Carotid artery
Correct Answer: C) Radial artery
Rationale: The radial artery is the most common site for ABG sampling due
to its accessibility and collateral circulation (tested by the Allen's test). The
brachial and femoral arteries are alternative sites, while the carotid is not
used.
4. A nurse is reviewing a client's ABG results: pH 7.30, PaCO2 50 mm Hg, HCO3
24 mEq/L. The nurse identifies this as which acid-base imbalance?
• A) Metabolic acidosis
• B) Metabolic alkalosis
• C) Respiratory acidosis
• D) Respiratory alkalosis
Correct Answer: C) Respiratory acidosis
Rationale: The pH is low (acidosis) and the PaCO2 is elevated (above 45),
indicating a respiratory cause. The HCO3 is normal, meaning this is acute
respiratory acidosis with no renal compensation yet.
5. A nurse is caring for a client with a PaO2 of 55 mm Hg. The nurse understands
that this value indicates which condition?
• A) Normal oxygenation
• B) Mild hypoxemia
• C) Moderate hypoxemia
• D) Severe hypoxemia
Correct Answer: C) Moderate hypoxemia
Rationale: Normal PaO2 is 80–100 mm Hg. Mild hypoxemia is 60–79,
moderate is 40–59, and severe is <40. A PaO2 of 55 mm Hg falls into the
moderate hypoxemia range.
,6. A nurse is explaining the oxyhemoglobin dissociation curve to a student. A
shift to the right indicates which change?
• A) Increased affinity of hemoglobin for oxygen
• B) Decreased release of oxygen to tissues
• C) Increased release of oxygen to tissues
• D) No change in oxygen delivery
Correct Answer: C) Increased release of oxygen to tissues
Rationale: A rightward shift (caused by acidosis, fever, or increased 2,3-
DPG) means hemoglobin holds onto oxygen less tightly, facilitating greater
unloading of oxygen to the tissues.
7. A nurse is assessing the respiratory effort of a newborn. Which finding is an
early sign of respiratory distress in an infant?
• A) Acrocyanosis
• B) Nasal flaring
• C) Periodic breathing
• D) Apnea lasting 10 seconds
Correct Answer: B) Nasal flaring
Rationale: Nasal flaring is an early compensatory mechanism in infants to
decrease airway resistance and increase airflow. Acrocyanosis (bluish
hands/feet) is common and benign in newborns. Periodic breathing and
brief apnea (<15 sec) can be normal.
8. A nurse is caring for a client with carbon monoxide poisoning. Which
statement explains why this is life-threatening?
• A) Carbon monoxide destroys alveolar walls
• B) Carbon monoxide binds to hemoglobin with a higher affinity than oxygen
• C) Carbon monoxide causes bronchoconstriction
• D) Carbon monoxide increases the production of mucus
Correct Answer: B) Carbon monoxide binds to hemoglobin with a higher
affinity than oxygen
, Rationale: Carbon monoxide has an affinity for hemoglobin approximately
200–300 times greater than oxygen, forming carboxyhemoglobin and
significantly reducing the blood's oxygen-carrying capacity.
9. A nurse is teaching about surfactant. What is the primary function of
surfactant in the lungs?
• A) To trap dust and pathogens
• B) To reduce surface tension in the alveoli
• C) To dilate the bronchioles
• D) To stimulate the cough reflex
Correct Answer: B) To reduce surface tension in the alveoli
Rationale: Surfactant, produced by type II alveolar cells, reduces surface
tension at the air-liquid interface, preventing alveolar collapse (atelectasis)
during expiration. This makes breathing easier.
10. A nurse is monitoring a client's oxygen saturation. What is the normal
expected range for SpO2 in a healthy adult?
• A) 75%–85%
• B) 85%–90%
• C) 95%–100%
• D) 100%–105%
Correct Answer: C) 95%–100%
Rationale: Normal pulse oximetry (SpO2) in a healthy adult is 95% to 100%.
Values below 90% indicate significant hypoxemia requiring intervention.
Assessment (11–20)
11. A nurse is auscultating lung sounds. Which sound is considered normal and
heard over the peripheral lung fields?
• A) Bronchial
• B) Bronchovesicular
Review of Airway Management, Respiratory Assessment, Oxygen
Therapy, Gas Exchange, and Evidence-Based Nursing Interventions for
Clinical Practice, Exam Preparation, and Patient Care Success
1. A nurse is explaining the physiology of gas exchange to a client. Which
structure is the primary site of oxygen and carbon dioxide exchange?
• A) Trachea
• B) Bronchioles
• C) Alveoli
• D) Pleura
Correct Answer: C) Alveoli
Rationale: The alveoli are the tiny, grape-like air sacs surrounded by
pulmonary capillaries where the actual exchange of gases (oxygen and
carbon dioxide) occurs via diffusion. The trachea and bronchioles are
conducting airways, and the pleura is the membrane surrounding the lungs.
2. A nurse is teaching about ventilation. Which statement correctly describes
this process?
• A) The movement of blood through the pulmonary capillaries
• B) The exchange of oxygen and carbon dioxide at the cellular level
• C) The mechanical movement of air into and out of the lungs
• D) The binding of oxygen to hemoglobin molecules
Correct Answer: C) The mechanical movement of air into and out of the
lungs
Rationale: Ventilation is the physical act of breathing (inspiration and
expiration). Perfusion (A) is blood flow. Diffusion (B) is gas exchange at the
alveolar-capillary membrane. Oxygen transport (D) involves hemoglobin.
3. A nurse is assessing a client's respiratory status. Which artery is most
commonly used to obtain an arterial blood gas (ABG) sample?
• A) Brachial artery
, • B) Femoral artery
• C) Radial artery
• D) Carotid artery
Correct Answer: C) Radial artery
Rationale: The radial artery is the most common site for ABG sampling due
to its accessibility and collateral circulation (tested by the Allen's test). The
brachial and femoral arteries are alternative sites, while the carotid is not
used.
4. A nurse is reviewing a client's ABG results: pH 7.30, PaCO2 50 mm Hg, HCO3
24 mEq/L. The nurse identifies this as which acid-base imbalance?
• A) Metabolic acidosis
• B) Metabolic alkalosis
• C) Respiratory acidosis
• D) Respiratory alkalosis
Correct Answer: C) Respiratory acidosis
Rationale: The pH is low (acidosis) and the PaCO2 is elevated (above 45),
indicating a respiratory cause. The HCO3 is normal, meaning this is acute
respiratory acidosis with no renal compensation yet.
5. A nurse is caring for a client with a PaO2 of 55 mm Hg. The nurse understands
that this value indicates which condition?
• A) Normal oxygenation
• B) Mild hypoxemia
• C) Moderate hypoxemia
• D) Severe hypoxemia
Correct Answer: C) Moderate hypoxemia
Rationale: Normal PaO2 is 80–100 mm Hg. Mild hypoxemia is 60–79,
moderate is 40–59, and severe is <40. A PaO2 of 55 mm Hg falls into the
moderate hypoxemia range.
,6. A nurse is explaining the oxyhemoglobin dissociation curve to a student. A
shift to the right indicates which change?
• A) Increased affinity of hemoglobin for oxygen
• B) Decreased release of oxygen to tissues
• C) Increased release of oxygen to tissues
• D) No change in oxygen delivery
Correct Answer: C) Increased release of oxygen to tissues
Rationale: A rightward shift (caused by acidosis, fever, or increased 2,3-
DPG) means hemoglobin holds onto oxygen less tightly, facilitating greater
unloading of oxygen to the tissues.
7. A nurse is assessing the respiratory effort of a newborn. Which finding is an
early sign of respiratory distress in an infant?
• A) Acrocyanosis
• B) Nasal flaring
• C) Periodic breathing
• D) Apnea lasting 10 seconds
Correct Answer: B) Nasal flaring
Rationale: Nasal flaring is an early compensatory mechanism in infants to
decrease airway resistance and increase airflow. Acrocyanosis (bluish
hands/feet) is common and benign in newborns. Periodic breathing and
brief apnea (<15 sec) can be normal.
8. A nurse is caring for a client with carbon monoxide poisoning. Which
statement explains why this is life-threatening?
• A) Carbon monoxide destroys alveolar walls
• B) Carbon monoxide binds to hemoglobin with a higher affinity than oxygen
• C) Carbon monoxide causes bronchoconstriction
• D) Carbon monoxide increases the production of mucus
Correct Answer: B) Carbon monoxide binds to hemoglobin with a higher
affinity than oxygen
, Rationale: Carbon monoxide has an affinity for hemoglobin approximately
200–300 times greater than oxygen, forming carboxyhemoglobin and
significantly reducing the blood's oxygen-carrying capacity.
9. A nurse is teaching about surfactant. What is the primary function of
surfactant in the lungs?
• A) To trap dust and pathogens
• B) To reduce surface tension in the alveoli
• C) To dilate the bronchioles
• D) To stimulate the cough reflex
Correct Answer: B) To reduce surface tension in the alveoli
Rationale: Surfactant, produced by type II alveolar cells, reduces surface
tension at the air-liquid interface, preventing alveolar collapse (atelectasis)
during expiration. This makes breathing easier.
10. A nurse is monitoring a client's oxygen saturation. What is the normal
expected range for SpO2 in a healthy adult?
• A) 75%–85%
• B) 85%–90%
• C) 95%–100%
• D) 100%–105%
Correct Answer: C) 95%–100%
Rationale: Normal pulse oximetry (SpO2) in a healthy adult is 95% to 100%.
Values below 90% indicate significant hypoxemia requiring intervention.
Assessment (11–20)
11. A nurse is auscultating lung sounds. Which sound is considered normal and
heard over the peripheral lung fields?
• A) Bronchial
• B) Bronchovesicular
