ESTUDYR
GAS EXCHANGE AND OXYGENATION – ATI UPDATED EXAM
WITH MOST TESTED QUESTIONS AND ANSWERS | GRADED A+
| ASSURED SUCCESS WITH DETAILED RATIONALES
Which structures are parts of the upper airway?
A. Trachea, bronchi, bronchioles
B. B. Nasopharynx (nose), oropharynx (mouth), larynx ✔
C. Alveoli and capillaries
D. Pulmonary arteries
Rationale: The upper airway includes nasopharynx, oropharynx, and larynx; trachea/bronchi
are lower airway.
Which structures are parts of the lower airway?
A. Nasopharynx, oropharynx
B. B. Trachea, bronchi, bronchioles, alveoli ✔
C. Larynx and pharynx
D. Nasal turbinates
Rationale: Lower airway begins at the trachea and includes the branching airways and alveoli.
How many lobes does the right lung have?
A. One
B. Two
C. C. Three ✔
D. Four
Rationale: Right lung has three lobes (upper, middle, lower); left lung has two.
What nervous systems innervate the lungs?
A. Somatic only
B. B. Parasympathetic and sympathetic nervous systems ✔
C. Enteric only
D. Autonomic is not involved
Rationale: Lungs receive autonomic innervation: parasympathetic (bronchoconstriction) and
sympathetic (bronchodilation).
What is surfactant?
A. A hormone that increases HR
B. B. A substance that reduces surface tension to prevent alveolar collapse ✔
C. A blood clotting factor
,ESTUDYR
D. A digestive enzyme
Rationale: Pulmonary surfactant lowers alveolar surface tension allowing stability during
exhalation.
Atelectasis is defined as:
A. Air in pleural space
B. B. Collapse of lung tissue with decreased lung volume ✔
C. Fluid in alveoli only
D. Chronic bronchitis
Rationale: Atelectasis is collapse/closure of alveoli leading to reduced gas exchange.
Which is a common cause of atelectasis?
A. High tidal volumes only
B. Hypotension only
C. C. Shallow breathing, airway obstruction, or external pressure on lung tissue ✔
D. Excess surfactant
Rationale: Shallow breathing, mucus plugs, or external compression can cause alveolar
collapse.
Which symptom commonly occurs with atelectasis?
A. Polyuria
B. Hypertension
C. C. Shortness of breath and low O₂ saturation ✔
D. Bradycardia
Rationale: Reduced ventilation causes hypoxemia and dyspnea.
Ventilation refers to:
A. Blood flow through the lung
B. Oxygen transport by hemoglobin
C. C. Airflow into and out of alveoli (movement of air) ✔
D. Cardiac output
Rationale: Ventilation = air movement; perfusion = blood flow.
Perfusion means:
A. Inhalation only
B. B. Blood flow through pulmonary capillaries delivering O₂ to tissues ✔
C. Mucus production
D. Respiratory rate
Rationale: Perfusion is circulation of blood in the pulmonary and systemic vascular beds.
, ESTUDYR
Which factor directly affects pulmonary perfusion?
A. Hair color
B. B. Blood pressure and cardiac output ✔
C. Room temperature only
D. Eye movement
Rationale: Perfusion depends on pressure gradients and cardiac pumping function.
Signs of poor perfusion include:
A. Flushed, warm skin only
B. B. Cold pale skin, weak pulses, delayed capillary refill, confusion ✔
C. Hyperactivity only
D. Hyperventilation only
Rationale: Poor perfusion causes signs of inadequate tissue oxygen delivery.
Diffusion in the lungs is:
A. Active transport of Na+
B. B. Passive gas exchange across alveolar-capillary membrane ✔
C. Movement of mucus
D. Mechanical ventilation support
Rationale: O₂ and CO₂ move by diffusion according to partial pressure gradients.
Lung compliance measures:
A. Resistance to infection
B. B. Ease with which lungs expand during inhalation ✔
C. Amount of surfactant only
D. Cardiac contractility
Rationale: High compliance = easy expansion; low compliance = stiff lungs.
Which condition causes low lung compliance?
A. Emphysema
B. B. Pulmonary fibrosis or ARDS (stiff lungs) ✔
C. Chronic bronchitis only
D. Upper airway obstruction
Rationale: Fibrosis and ARDS make lungs stiff, reducing compliance.
Which condition causes high lung compliance?
A. ARDS
B. B. Emphysema (loss of elastic recoil) ✔
C. Pulmonary fibrosis
GAS EXCHANGE AND OXYGENATION – ATI UPDATED EXAM
WITH MOST TESTED QUESTIONS AND ANSWERS | GRADED A+
| ASSURED SUCCESS WITH DETAILED RATIONALES
Which structures are parts of the upper airway?
A. Trachea, bronchi, bronchioles
B. B. Nasopharynx (nose), oropharynx (mouth), larynx ✔
C. Alveoli and capillaries
D. Pulmonary arteries
Rationale: The upper airway includes nasopharynx, oropharynx, and larynx; trachea/bronchi
are lower airway.
Which structures are parts of the lower airway?
A. Nasopharynx, oropharynx
B. B. Trachea, bronchi, bronchioles, alveoli ✔
C. Larynx and pharynx
D. Nasal turbinates
Rationale: Lower airway begins at the trachea and includes the branching airways and alveoli.
How many lobes does the right lung have?
A. One
B. Two
C. C. Three ✔
D. Four
Rationale: Right lung has three lobes (upper, middle, lower); left lung has two.
What nervous systems innervate the lungs?
A. Somatic only
B. B. Parasympathetic and sympathetic nervous systems ✔
C. Enteric only
D. Autonomic is not involved
Rationale: Lungs receive autonomic innervation: parasympathetic (bronchoconstriction) and
sympathetic (bronchodilation).
What is surfactant?
A. A hormone that increases HR
B. B. A substance that reduces surface tension to prevent alveolar collapse ✔
C. A blood clotting factor
,ESTUDYR
D. A digestive enzyme
Rationale: Pulmonary surfactant lowers alveolar surface tension allowing stability during
exhalation.
Atelectasis is defined as:
A. Air in pleural space
B. B. Collapse of lung tissue with decreased lung volume ✔
C. Fluid in alveoli only
D. Chronic bronchitis
Rationale: Atelectasis is collapse/closure of alveoli leading to reduced gas exchange.
Which is a common cause of atelectasis?
A. High tidal volumes only
B. Hypotension only
C. C. Shallow breathing, airway obstruction, or external pressure on lung tissue ✔
D. Excess surfactant
Rationale: Shallow breathing, mucus plugs, or external compression can cause alveolar
collapse.
Which symptom commonly occurs with atelectasis?
A. Polyuria
B. Hypertension
C. C. Shortness of breath and low O₂ saturation ✔
D. Bradycardia
Rationale: Reduced ventilation causes hypoxemia and dyspnea.
Ventilation refers to:
A. Blood flow through the lung
B. Oxygen transport by hemoglobin
C. C. Airflow into and out of alveoli (movement of air) ✔
D. Cardiac output
Rationale: Ventilation = air movement; perfusion = blood flow.
Perfusion means:
A. Inhalation only
B. B. Blood flow through pulmonary capillaries delivering O₂ to tissues ✔
C. Mucus production
D. Respiratory rate
Rationale: Perfusion is circulation of blood in the pulmonary and systemic vascular beds.
, ESTUDYR
Which factor directly affects pulmonary perfusion?
A. Hair color
B. B. Blood pressure and cardiac output ✔
C. Room temperature only
D. Eye movement
Rationale: Perfusion depends on pressure gradients and cardiac pumping function.
Signs of poor perfusion include:
A. Flushed, warm skin only
B. B. Cold pale skin, weak pulses, delayed capillary refill, confusion ✔
C. Hyperactivity only
D. Hyperventilation only
Rationale: Poor perfusion causes signs of inadequate tissue oxygen delivery.
Diffusion in the lungs is:
A. Active transport of Na+
B. B. Passive gas exchange across alveolar-capillary membrane ✔
C. Movement of mucus
D. Mechanical ventilation support
Rationale: O₂ and CO₂ move by diffusion according to partial pressure gradients.
Lung compliance measures:
A. Resistance to infection
B. B. Ease with which lungs expand during inhalation ✔
C. Amount of surfactant only
D. Cardiac contractility
Rationale: High compliance = easy expansion; low compliance = stiff lungs.
Which condition causes low lung compliance?
A. Emphysema
B. B. Pulmonary fibrosis or ARDS (stiff lungs) ✔
C. Chronic bronchitis only
D. Upper airway obstruction
Rationale: Fibrosis and ARDS make lungs stiff, reducing compliance.
Which condition causes high lung compliance?
A. ARDS
B. B. Emphysema (loss of elastic recoil) ✔
C. Pulmonary fibrosis
