Question 1

Case: A 45-year-old male presents with a persistent cough, shortness of breath, and wheezing for the past 3 months. He works in a furniture factory. Spirometry shows an FEV1/FVC ratio of 65%. Question: What is the most likely diagnosis?

Accepted Answer

Answer reason: An FEV1/FVC ratio of 65% indicates an obstructive ventilatory defect. In a 45-year-old with chronic cough, dyspnea, and wheeze, persistent airflow limitation is most consistent with COPD rather than a purely episodic, reversible process. Pulmonary fibrosis typically causes a restrictive pattern with a normal or increased FEV1/FVC ratio, and bronchiectasis is classically associated with chronic productive cough and recurrent infections rather than isolated spirometric obstruction.
Category reason: This question tests interpretation of spirometry (obstructive vs restrictive pattern) to identify a respiratory diagnosis, which is foundational biomedical knowledge under the Respiratory System.

Question 2

In FOLLOWING which ORGAN is known as a WINDPIPE-?

Accepted Answer

Answer reason: The windpipe refers to the main airway that conducts air from the larynx down toward the lungs. This structure is supported by C-shaped cartilaginous rings that keep the airway open during breathing. The larynx is the voice box above it, while bronchi are the branches that arise after it divides, and the lungs are the organs of gas exchange.
Category reason: This is a foundational anatomy/physiology identification question about a respiratory structure commonly termed the windpipe, which falls under the Respiratory System.

Question 3

Which structure is primarily responsible for gas exchange in the lungs?

Accepted Answer

Answer reason: Gas exchange occurs across the thin alveolar-capillary membrane, where oxygen diffuses into pulmonary capillary blood and carbon dioxide diffuses into the alveolar air. The bronchi and trachea primarily conduct air and provide airway clearance but are not the main sites of diffusion. The pleura is a serous membrane that reduces friction and helps maintain negative intrapleural pressure, not a gas-exchange surface.
Category reason: This question tests foundational knowledge of where pulmonary diffusion occurs, which is core respiratory anatomy/physiology rather than a nursing care decision.

Question 4

A pulse ox reading below which value indicates hypoxemia?

Accepted Answer

Answer reason: In general clinical practice, hypoxemia is suggested when oxygen saturation falls below about 90%, which corresponds roughly to a PaO2 near 60 mmHg on the oxyhemoglobin dissociation curve. Below this point, the curve becomes steep, so small decreases in PaO2 cause large drops in SpO2 and reduced oxygen delivery. Values like 92–95% are typically acceptable for many adults (though targets may differ in COPD or other conditions), whereas readings under 90% warrant prompt assessment and intervention.
Category reason: This item tests interpretation of pulse oximetry as a measure of blood oxygenation and the threshold used to define hypoxemia, which is a core concept of respiratory physiology/oxygenation.

Question 5

To what pressure an endotracheal tube must be inflated to produce an adequate seal between the cuff and the wall of the trachea /?

Accepted Answer

Answer reason: An endotracheal tube cuff should be inflated to the minimum pressure that prevents air leak and aspiration risk while maintaining tracheal mucosal perfusion. Pressures above capillary perfusion pressure can cause tracheal ischemia and injury; too low increases leak and aspiration. The commonly accepted safe range is about 20–30 cm H2O (roughly 15–22 mmHg), making this value an appropriate target for an adequate seal.
Category reason: This tests knowledge of airway management physiology and safe cuff-pressure targets for maintaining a tracheal seal, which is a Respiratory System concept rather than a nursing judgment/prioritization scenario.

Question 6

Which is a common cause of central cyanosis?

Accepted Answer

Answer reason: Central cyanosis results from decreased arterial oxygen saturation or increased deoxygenated hemoglobin in the blood, causing bluish discoloration of the lips and mucous membranes. This is most directly caused by low blood oxygen levels (hypoxemia), commonly due to ventilation-perfusion mismatch, hypoventilation, diffusion impairment, or right-to-left shunt. Sunburn does not reduce arterial oxygenation, and hypothermia more often causes peripheral cyanosis via vasoconstriction. Asthma can contribute to hypoxemia in severe cases, but the underlying common cause being tested is hypoxemia itself.
Category reason: This question tests the physiologic cause of a clinical sign (central cyanosis) related to arterial oxygenation, which is primarily a Respiratory System concept rather than a nursing intervention/prioritization task.

Question 7

The nurse observes that Mr. Adams begins to have increased difficulty breathing. She elevates the head of the bed to the high Fowler position, which decreases his respiratory distress. The nurse documents this breathing as?

Accepted Answer

Answer reason: C. Orthopnea Difficulty breathing that improves when the patient sits upright is characteristic of needing an elevated position to breathe comfortably. Raising the head of the bed to high Fowler’s reduces venous return and improves diaphragmatic excursion, decreasing dyspnea seen in conditions like heart failure or pulmonary congestion. Tachypnea is only increased rate, eupnea is normal breathing, and hyperventilation refers to ventilation exceeding metabolic needs with typically lowered PaCO2.
Category reason: This question tests recognition of a respiratory breathing pattern/term (positional dyspnea relieved by sitting up), which is foundational respiratory physiology terminology rather than a nursing prioritization or intervention decision.

Question 8

What is the common complication of pneumonia?

Accepted Answer

Answer reason: Inflammation from a lung infection commonly extends to the pleura, increasing capillary permeability and leading to fluid accumulation in the pleural space. This is a frequent complication of bacterial pneumonia and can worsen dyspnea and reduce lung expansion. Ear and skin infections are not typical direct complications of pneumonia, and kidney stones are unrelated to respiratory infection pathophysiology.
Category reason: This question tests a common complication of a pulmonary infection, focusing on disease processes and outcomes within the respiratory system rather than nursing interventions or prioritization.

Question 9

Which test is best for confirming pneumonia?

Accepted Answer

Answer reason: Chest radiography is the standard initial test to confirm suspected pneumonia because it can demonstrate new pulmonary infiltrates or consolidation consistent with infection. EEG and ECG assess neurologic and cardiac electrical activity and do not diagnose lung parenchymal infection. Abdominal ultrasound evaluates intra-abdominal organs and is not appropriate for confirming a pulmonary diagnosis.
Category reason: This question tests diagnostic confirmation of a lung infection using an imaging study, which is core Respiratory System knowledge rather than nursing management or prioritization.

Question 10

Which structure produces sound when air passes through it?

Accepted Answer

Answer reason: It contains the vocal cords (vocal folds), which vibrate as air passes through, generating sound (phonation). The trachea and bronchi primarily conduct air and do not create voice. The pharynx acts mainly as a shared passageway for air and food and contributes to resonance rather than sound production.
Category reason: This question tests knowledge of the airway structure responsible for phonation, a core topic within the respiratory system anatomy and function rather than a nursing intervention or prioritization scenario.

Question 11

Which part of the respiratory system warms and filters inhaled air?

Accepted Answer

Answer reason: The nasal cavity contains turbinates and a highly vascular mucosa that warms incoming air and mucous membranes that humidify it. Nasal hairs and mucus trap larger particles, while cilia help move debris toward the pharynx for removal. The trachea and bronchioles have mucociliary clearance but are not the primary site for warming and initial filtration, and alveoli are specialized for gas exchange.
Category reason: This question tests a core function of an upper airway structure (conditioning inspired air), which is foundational respiratory system knowledge rather than a nursing intervention or prioritization task.

Question 12

Patient come in for chronic COPD you recommend him long term oxygen therapy for home how many hr. you will recommend him oxygen therapy to use every day?

Accepted Answer

Answer reason: Long-term oxygen therapy for chronic hypoxemic COPD provides survival benefit when used for most of the day, classically at least 15 hours daily, with greater benefit as duration approaches continuous use. Many guidelines and teaching references recommend ~18–24 hours/day to maximize correction of chronic hypoxemia and reduce pulmonary hypertension progression. Among the given choices, 20 hours best matches the “most of the day/nearly continuous” recommendation. Shorter durations (3–15 hours) are less consistent with the evidence-based target for LTOT benefit.
Category reason: This item tests foundational knowledge of recommended duration of long-term oxygen therapy in COPD, which is a respiratory disease management concept rather than a nursing prioritization/intervention scenario.

Question 13

A newborn develops respiratory distress at birth w, the mouth is closed. The most likely diagnosis is?

Accepted Answer

Answer reason: Newborns are preferential nasal breathers, so bilateral posterior nasal obstruction can cause immediate respiratory distress, particularly when the mouth is not open to provide an alternate airway. Symptoms classically worsen during feeding and improve with crying because crying forces mouth breathing. This presentation fits congenital occlusion of the choanae rather than partial narrowing (stenosis) or disorders primarily causing micrognathia/glossoptosis or immunologic anomalies.
Category reason: This is a diagnosis question about a congenital cause of neonatal airway obstruction and breathing mechanics, which is primarily respiratory pathophysiology rather than a nursing intervention/prioritization scenario.

Question 14

Most common cause of chronic Asthma?

Accepted Answer

Answer reason: Among the choices, this is the chronic obstructive airway condition most aligned with long-standing airflow limitation and hyperinflation physiology. The other options are not typical primary causes of a chronic obstructive picture: atelectasis is lung collapse, pneumonia is acute infection, and pulmonary fibrosis causes restrictive (not obstructive) disease. Although asthma itself is a separate chronic inflammatory airway disease, the best match within the provided options is the chronic obstructive pathology listed.
Category reason: This item tests knowledge of chronic respiratory diseases and how they differ from acute infection, collapse, and restrictive interstitial lung disease, so it fits the Respiratory System subject area.

Question 15

Which of the following is a typical finding in a patient with emphysema?

Accepted Answer

Answer reason: Emphysema causes destruction of alveolar walls with loss of elastic recoil, leading to air trapping and lung hyperinflation. Chronic hyperinflation increases the anteroposterior diameter of the chest, producing a classic barrel-shaped chest. Increased sputum production is more typical of chronic bronchitis, while cyanosis is often a later/severe finding and hemoptysis is not characteristic of uncomplicated emphysema.
Category reason: This question tests characteristic clinical features of emphysema and COPD-related structural changes in the lungs, which primarily falls under the Respiratory System in foundational nursing science.

Question 16

Which diagnostic test is most commonly used to assess lung function in asthma?

Accepted Answer

Answer reason: It directly measures airflow limitation (e.g., FEV1, FVC, and the FEV1/FVC ratio) and demonstrates the characteristic reversible obstruction of asthma, especially after bronchodilator administration. It is the standard, most commonly used objective test to diagnose and monitor asthma severity and response to therapy. Chest X-ray is mainly to rule out alternative diagnoses/complications, ABG is reserved for severe exacerbations or impending respiratory failure, and ECG evaluates cardiac rhythm rather than pulmonary function.
Category reason: This question tests the standard diagnostic method for evaluating airflow obstruction and reversibility in asthma, which is a core topic within respiratory system assessment and function.

Question 17

Smoking can cause cancer of the?

Accepted Answer

Answer reason: Tobacco smoke contains multiple carcinogens that directly damage bronchial and alveolar epithelial DNA, leading to malignant transformation over time. Smoking is the leading modifiable risk factor for lung cancer and is strongly linked to both small cell and non–small cell types. While smoking is also associated with several other cancers, the most classic and strongest association in standard health education is lung cancer.
Category reason: This question tests foundational knowledge of how smoking affects the respiratory tract and its cancer risks, which best fits the Respiratory System subject area rather than a nursing-intervention scenario.

Question 18

Which complications are most commonly associated with chronic obstructive pulmonary disease (COPD)?

Accepted Answer

Answer reason: Chronic hypoxemia and pulmonary vasoconstriction in COPD increase pulmonary vascular resistance, leading to pulmonary hypertension. This places strain on the right ventricle, causing right ventricular hypertrophy and potential right-sided heart failure (cor pulmonale). These cardiopulmonary complications are common and clinically important in advanced COPD compared with primary joint, renal, or peripheral nerve complications.
Category reason: This item tests common pathophysiologic complications of a respiratory disease (COPD) and its effects on cardiopulmonary circulation, which is foundational biomedical knowledge within the Respiratory System.

Question 19

Which destruction of walls of Alveli is found?

Accepted Answer

Answer reason: This condition is characterized by permanent enlargement of airspaces distal to the terminal bronchioles with destruction of alveolar septa, leading to loss of elastic recoil. The resulting air trapping and reduced alveolar surface area impair gas exchange and contribute to hyperinflation. In contrast, pneumonia primarily fills alveoli with inflammatory exudate, asthma involves reversible bronchial hyperreactivity/bronchoconstriction, and bronchitis features airway inflammation and mucus hypersecretion rather than alveolar wall destruction.
Category reason: This item tests foundational pathophysiology of specific respiratory diseases (alveolar wall destruction), which is biomedical knowledge rather than a nursing intervention decision.

Question 20

Inflammation of the brochial tube called?

Accepted Answer

Answer reason: Inflammation of the bronchial tubes is termed bronchitis, typically causing cough and mucus production due to airway mucosal edema and increased secretions. Pneumonia primarily involves infection/inflammation of the alveoli and lung parenchyma. Emphysema is alveolar wall destruction with airspace enlargement, not bronchial inflammation. Pleurisy refers to inflammation of the pleura, producing pleuritic chest pain.
Category reason: This tests recognition of a respiratory condition defined by inflammation of a specific airway structure (bronchial tubes), which is foundational Respiratory System knowledge rather than a nursing intervention scenario.

Question 21

Asthma disease located in?

Accepted Answer

Answer reason: Asthma is a chronic inflammatory disorder of the airways (bronchi/bronchioles) that causes bronchoconstriction, mucosal edema, and increased mucus production. These changes occur within the respiratory tract and lead to wheezing, dyspnea, and cough. The primary organ system involved is therefore the lungs and airways, not abdominal organs or the heart.
Category reason: This question tests basic knowledge of which organ system is affected by asthma, a respiratory airway disease, so it fits the Respiratory System subject area.

Question 22

Lungs are enclosed within ________.?

Accepted Answer

Answer reason: The lungs are covered by the visceral pleura and lined externally by the parietal pleura, together forming the pleural membranes with a thin lubricating pleural fluid layer to reduce friction during breathing. The pericardium encloses the heart, the periosteum covers bone, and the perichondrium surrounds cartilage. Therefore, the structure that encloses the lungs is the pleural membrane.
Category reason: This is a foundational anatomy/physiology question about the membranes surrounding the lungs, which is primarily tested under the Respiratory System rather than nursing interventions or clinical decision-making.

Question 23

Larynx is the part of _?

Accepted Answer

Answer reason: The larynx is part of the upper airway, positioned between the pharynx and trachea, and functions in maintaining a patent airway and conducting air to the lower respiratory tract. It also protects the airway during swallowing via the epiglottis and contributes to phonation through the vocal cords. These functions align with the respiratory system rather than digestive or circulatory systems.
Category reason: This is a foundational anatomy/physiology identification question about which body system includes the larynx, which falls under the Respiratory System.

Question 24

A 50-year-old man presents to the clinic with a 3-month history of persistent cough and weight loss. On physical examination, he has a dull percussion note over the left upper lung. What is the most likely diagnosis?

Accepted Answer

Answer reason: A chronic cough lasting months with systemic symptoms such as weight loss strongly suggests a chronic infectious process rather than an acute condition. Upper-lobe involvement is classically associated with reactivation disease due to higher oxygen tension favoring Mycobacterium tuberculosis. Dullness to percussion can occur from parenchymal consolidation or fibrosis in the affected region. Pulmonary embolism typically presents more acutely with pleuritic chest pain and dyspnea, and uncomplicated pneumonia is usually shorter in duration without prolonged constitutional symptoms.
Category reason: This item tests recognition of a likely pulmonary diagnosis based on symptom duration, systemic features, and exam findings, which is foundational disease recognition within the Respiratory System rather than a nursing intervention/prioritization scenario.

Question 25

Which complication is most commonly associated with prolonged mechanical ventilation in neonates?

Accepted Answer

Answer reason: Prolonged mechanical ventilation and oxygen exposure can cause ventilator-induced lung injury in premature/neonatal lungs, leading to inflammation, impaired alveolar development, and chronic lung disease. This complication is classically linked to long durations of positive-pressure ventilation and high oxygen concentrations. While sepsis and intraventricular hemorrhage are important neonatal risks in intensive care, they are not the most characteristic complication specifically associated with prolonged ventilation duration.
Category reason: This item tests knowledge of a classic pulmonary complication (chronic lung disease) resulting from mechanical ventilation/oxygen toxicity in neonates, which is primarily respiratory pathophysiology rather than a nursing-priority/action question.

Question 26

What is the main gas we inhale?

Accepted Answer

Answer reason: The key physiologic purpose of inhalation is to bring in oxygen for alveolar gas exchange so it can diffuse into pulmonary capillary blood and support aerobic cellular metabolism. Carbon dioxide is primarily a waste gas that is eliminated during exhalation. Hydrogen is not a meaningful component of atmospheric air for human respiration and is not used as a primary respiratory gas.
Category reason: This item tests foundational knowledge of breathing and gas exchange, which is part of respiratory system physiology rather than nursing interventions or clinical decision-making.

Question 27

Lungs of mammals are normally enclosed within --------?

Accepted Answer

Answer reason: B. Pleural membrane The lungs are covered by visceral pleura and the thoracic cavity is lined by parietal pleura, forming the pleural sac with a thin lubricating fluid layer between them to reduce friction during breathing. Periosteum surrounds bone, pericardium encloses the heart, and perichondrium surrounds cartilage, so they do not normally enclose the lungs. The pleural membranes also help maintain negative intrapleural pressure to keep the lungs expanded.
Category reason: This question tests foundational knowledge of the anatomical covering of the lungs, which is part of the Respiratory System rather than a nursing-care decision.

Question 28

What is the gold standard test for diagnosing cystic fibrosis?

Accepted Answer

Answer reason: The diagnostic standard is quantitative pilocarpine iontophoresis to measure sweat chloride, which is characteristically elevated due to CFTR dysfunction causing impaired chloride transport. Other listed tests are not confirmatory: urea breath test evaluates H. pylori, ESR is nonspecific inflammation, and sputum culture helps identify infecting organisms but does not establish the diagnosis. Confirmatory evaluation is typically paired with clinical features and/or genetic testing, but sweat chloride testing remains the classic gold standard.
Category reason: This question tests foundational knowledge of the definitive diagnostic test for a pulmonary/genetic disease rather than a nursing intervention or prioritization decision, fitting NursingScience under the Respiratory System.

Question 29

Which part of the human respiratory system is also known as the windpipe?

Accepted Answer

Answer reason: B) Trachea The windpipe refers to the trachea, the rigid airway that connects the larynx to the main bronchi and conducts air to and from the lungs. It is supported by C-shaped cartilaginous rings that help keep the airway patent during breathing. Bronchi are the branches that come after the trachea, alveoli are distal gas-exchange sacs, and the larynx is the voice box above the trachea.
Category reason: This is a foundational anatomy/physiology identification question about a named structure of the airway, which falls under the Respiratory System rather than nursing decision-making or patient-care interventions.

Question 30

Larynx is the part of System?

Accepted Answer

Answer reason: The larynx (voice box) is part of the upper airway and connects the pharynx to the trachea, helping conduct air to the lungs. It contains the vocal cords and protects the lower airway during swallowing via the epiglottis and glottic closure. These core functions are integral to breathing and airway protection, which are respiratory system roles.
Category reason: This is a foundational anatomy/physiology identification question asking which body system a structure belongs to, which fits NursingScience under the Respiratory System.

Question 31

The nurse is caring for a client with suspected emphysema. Which of the following findings would be consistent with a diagnosis of emphysema?

Accepted Answer

Answer reason: Emphysema causes air trapping and hyperinflation due to destruction of alveolar walls, increasing the amount of air in the lungs. This increased air content produces a hyperresonant note to chest percussion and is a classic physical assessment finding. The other options are not typical diagnostic findings of emphysema: pleuritic sharp inspiratory pain suggests pleurisy/pneumothorax, and low hemoglobin/hematocrit reflects anemia rather than COPD pathology.
Category reason: This item tests recognition of a classic physical exam finding associated with emphysema (air trapping leading to hyperinflation), which is foundational respiratory system knowledge rather than a nursing intervention or prioritization decision.

Question 32

A factor predisposing a person to nosocomial pneumonia is?

Accepted Answer

Answer reason: Endotracheal tubes bypass normal upper-airway defenses and impair cough and mucociliary clearance, allowing aspiration of colonized secretions into the lower respiratory tract. The tube also promotes biofilm formation and provides a direct conduit for bacteria, which markedly increases risk of hospital-acquired/ventilator-associated pneumonia. Compared with the other listed factors, airway instrumentation is the strongest and most consistently associated risk factor for nosocomial pneumonia in hospitalized patients.
Category reason: This question tests risk factors and pathophysiology of hospital-acquired pneumonia (especially ventilator-associated pneumonia), which is primarily respiratory-system biomedical knowledge rather than a nursing action/prioritization scenario.

Question 33

Cyanosis occurs due to lack of?

Accepted Answer

Answer reason: Cyanosis is the bluish discoloration of skin and mucous membranes caused by increased deoxygenated hemoglobin in capillary blood, most commonly from inadequate oxygenation (hypoxemia) or impaired circulation. Reduced arterial oxygen saturation leads to higher levels of deoxygenated hemoglobin, producing the characteristic blue color, especially in lips and nail beds. Water and platelets are not directly involved in skin color changes, and a lack of hemoglobin typically causes pallor rather than cyanosis.
Category reason: This question tests the physiologic basis of cyanosis related to oxygenation and blood oxygen saturation, which is core Respiratory System science rather than a nursing intervention or prioritization scenario.

Question 34

Which gas do humans exhale during respiration?

Accepted Answer

Answer reason: Cellular respiration produces carbon dioxide as a waste product when nutrients are metabolized for energy. This CO2 is transported in the blood (largely as bicarbonate) to the lungs. In the alveoli it diffuses down its partial-pressure gradient into exhaled air, helping regulate acid–base balance via ventilation.
Category reason: This question tests basic physiology of gas exchange and the primary waste gas eliminated by the lungs, which belongs to the Respiratory System.

Question 35

Aspiration of a foreign body is most likely to lodge in which bronchus?

Accepted Answer

Answer reason: The right main bronchus is wider, shorter, and more vertically oriented than the left, creating a more direct path from the trachea. Because of this anatomical alignment, aspirated material more commonly enters the right bronchial tree. This is a classic clinical anatomy fact underlying the distribution of foreign body aspiration findings. While patient position can influence where material settles, the right main bronchus remains the most likely initial site.
Category reason: This item tests core airway anatomy determining where aspirated objects most commonly lodge, which is foundational knowledge within the Respiratory System rather than a nursing intervention or prioritization decision.

Question 36

Main respiratory Organ of Human Body is.?

Accepted Answer

Answer reason: Gas exchange (oxygen uptake and carbon dioxide elimination) occurs in the alveoli, which are located within the lungs, making them the primary organs of respiration. The nostrils, trachea, and bronchi are conducting airways that move and condition air but do not perform the key exchange function. Therefore, the lungs are the main respiratory organs.
Category reason: This question tests identification of the principal organ responsible for respiration and gas exchange, which is core content of the Respiratory System.

Question 37

Which organ helps you breathe in oxygen and breathe out carbon dioxide?

Accepted Answer

Answer reason: Gas exchange occurs in the alveoli, where oxygen diffuses into pulmonary capillary blood and carbon dioxide diffuses from blood into the air spaces to be exhaled. Ventilation (air movement) and perfusion (blood flow) together enable effective oxygen uptake and CO2 removal. The heart pumps blood but does not perform diffusion-based gas exchange, and the liver is primarily involved in metabolism and detoxification rather than breathing.
Category reason: This question tests basic organ function in breathing and gas exchange, which is core content of the Respiratory System in foundational nursing science.

Question 38

Case: A 55-year-old chronic smoker presents with progressive shortness of breath and a barrel-shaped chest. Spirometry shows a reduced FEV1/FVC ratio. Question: What is the most likely diagnosis?

Accepted Answer

Answer reason: A chronic smoking history with progressive dyspnea and a barrel-shaped chest strongly suggests emphysema-predominant COPD with lung hyperinflation. The reduced FEV1/FVC ratio indicates an obstructive ventilatory defect, which is characteristic of COPD and asthma but COPD is more consistent with this age group and smoking exposure. Pulmonary fibrosis typically produces a restrictive pattern with a normal or increased FEV1/FVC ratio. Bronchiectasis often features chronic productive cough and recurrent infections rather than classic hyperinflation with a persistent low FEV1/FVC.
Category reason: This item tests interpretation of spirometry patterns and clinical features to identify an obstructive lung disease diagnosis, which is core respiratory-system biomedical knowledge rather than nursing interventions or prioritization.

Question 39

Gas exchange in the lungs happens by process of ________.

Accepted Answer

Answer reason: Alveolar-capillary gas exchange occurs as oxygen and carbon dioxide move down their respective partial pressure gradients across the thin respiratory membrane. This is a passive process requiring no cellular energy and depends on factors such as surface area, membrane thickness, and gradient magnitude. Osmosis applies to water movement, while exocytosis and active transport are cellular mechanisms not responsible for bulk alveolar gas transfer.
Category reason: This tests the fundamental physiologic mechanism of pulmonary gas exchange (movement of O2/CO2 across the alveolar-capillary membrane), which is core Respiratory System science rather than a nursing intervention or prioritization task.

Question 40

What does happen during relaxation of muscles of diaphragm except-?

Accepted Answer

Answer reason: During diaphragmatic relaxation (expiration), the diaphragm domes upward, reducing the vertical dimension of the thoracic cavity. This decreases thoracic volume, raises intrathoracic (alveolar) pressure relative to atmospheric pressure, and drives air out of the lungs. Therefore, an increase in the length of the thoracic cavity is the statement that does not occur.
Category reason: This question tests the mechanics of breathing (effects of diaphragm relaxation on thoracic volume and pressure), which is core Respiratory System physiology rather than a nursing intervention or prioritization task.

Question 41

Which of these diseases affects the airways?

Accepted Answer

Answer reason: Asthma is a chronic inflammatory disorder of the bronchial airways characterized by bronchial hyperresponsiveness, bronchoconstriction, and mucus production, leading to airflow obstruction. Parkinson's disease is a neurodegenerative disorder primarily affecting motor control, and diabetes is an endocrine/metabolic disorder involving impaired glucose regulation rather than direct airway pathology. Therefore, among the listed options, asthma is the disease that affects the airways.
Category reason: This item tests which condition primarily involves the bronchial airways and airflow obstruction, which is a core concept within the Respiratory System.

Question 42

Which diagnostic test is used to confirm pulmonary embolism?

Accepted Answer

Answer reason: This is the standard confirmatory imaging test for suspected pulmonary embolism because it directly visualizes thrombus in the pulmonary arterial tree. Chest X-ray and ECG are commonly obtained but are nonspecific and mainly help assess alternative diagnoses or complications. A D-dimer is a sensitive screening test used to help rule out PE in low-risk patients, but it does not confirm the diagnosis.
Category reason: This question tests knowledge of the definitive diagnostic modality for a cardiopulmonary pathology (pulmonary embolism), which is core content within the Respiratory System rather than nursing care prioritization or interventions.

Question 43

Which is a part of the respiratory system?

Accepted Answer

Answer reason: They are the primary organs responsible for gas exchange, taking in oxygen and removing carbon dioxide via the alveoli. The brain is part of the central nervous system, and the stomach is part of the gastrointestinal system. Therefore, among the options listed, only one belongs to the respiratory system.
Category reason: This question tests identification of an organ within the respiratory system, which is foundational body-systems knowledge classified under the Respiratory System.

Question 44

"Blue Bloater" term is commonly used for?

Accepted Answer

Answer reason: Chronic bronchitis is classically associated with the “blue bloater” phenotype of COPD due to chronic hypoventilation and V/Q mismatch causing hypoxemia and cyanosis. Persistent productive cough and airway inflammation lead to CO2 retention and secondary pulmonary hypertension, contributing to fluid retention and edema. In contrast, emphysema is more associated with the “pink puffer” phenotype with less cyanosis and more prominent dyspnea and weight loss.
Category reason: This tests recognition of a classic COPD clinical descriptor and its association with a specific pulmonary disease, which is foundational knowledge within the Respiratory System.

Question 45

Paradoxical respiration is most commonly seen in ?

Accepted Answer

Answer reason: Paradoxical respiration refers to inward movement of a segment of the chest wall during inspiration and outward movement during expiration due to loss of bony stability. This occurs when multiple adjacent ribs are fractured in at least two places, creating a free-floating segment. The negative intrathoracic pressure generated on inspiration pulls the unstable segment inward, impairing ventilation and increasing work of breathing. The other options may cause dyspnea or pulsus paradoxus (e.g., tamponade) but do not classically produce paradoxical chest wall motion.
Category reason: This question tests recognition of a characteristic respiratory mechanical finding (paradoxical chest wall movement) and its classic associated condition, which is core content of the Respiratory System.

Question 46

Upon assessing Rosa’s lung sounds, there is a high-pitched noise that the student nurse is not quite sure of the name. What are the common breath sounds for pneumonia which is fluid in the lungs?

Accepted Answer

Answer reason: A. Crackles Fluid in the alveoli and small airways causes intermittent popping or crackling sounds, especially on inspiration, which is classically associated with pneumonia and pulmonary edema. Rhonchi are lower-pitched, coarse “snoring” sounds typically from secretions in larger airways and may clear with coughing. Wheezes are musical sounds from narrowed airways (e.g., asthma), and stridor is a harsh inspiratory sound from upper-airway obstruction and is a medical emergency finding.
Category reason: This item tests recognition of abnormal breath sounds associated with pulmonary fluid/consolidation, which is foundational respiratory assessment knowledge rather than a nursing intervention or prioritization decision.

Question 47

Which one is the major air passage that lead to the lungs...?

Accepted Answer

Answer reason: The trachea is the main conducting airway that carries air from the larynx down to the point where it divides into the right and left main bronchi, which then enter the lungs. Bronchi are major branches within the lungs, bronchioles are smaller distal airways, and alveoli are the sites of gas exchange rather than passageways. Therefore, the trachea is the major air passage leading to the lungs.
Category reason: This question tests identification of a key structure of the conducting airways and its role in airflow to the lungs, which is core Respiratory System anatomy/physiology knowledge rather than nursing management or interventions.

Question 48

Which intercostal muscles are primarily active during inspiration?

Accepted Answer

Answer reason: These muscles elevate the ribs and expand the thoracic cavity, increasing intrathoracic volume and lowering intrathoracic pressure to draw air into the lungs. In contrast, the internal intercostals (especially the interosseous portion) are mainly recruited during forced expiration to depress the ribs. The innermost intercostals and subcostals generally assist expiration rather than serving as the primary inspiratory intercostals.
Category reason: This is a foundational question about mechanics of breathing and which muscle group contributes to inspiration, which fits best under Respiratory System physiology/anatomy rather than nursing interventions or safety.

Question 49

What is the main function of the respiratory system?

Accepted Answer

Answer reason: The respiratory system’s primary role is to bring oxygen into the body and remove carbon dioxide from the body to maintain normal blood gases and acid–base balance. This occurs mainly at the alveoli, where diffusion moves O2 into pulmonary capillary blood and CO2 into the alveolar air to be exhaled. Digestion is a gastrointestinal function, and circulation is primarily a cardiovascular function, though both interact with respiration.
Category reason: This item tests the core physiological role of lungs and alveoli in oxygen and carbon dioxide transfer, which is foundational content within the Respiratory System.

Question 50

Patient: 55-year-old male Presentation: Acute breathlessness x1 day, h/o COPD, using inhalers. Expiratory wheeze, mild accessory muscle use. Possible Dx:

Accepted Answer

Answer reason: Given known COPD with acute dyspnea plus expiratory wheeze and accessory muscle use, an acute COPD exacerbation is the most likely diagnosis. Pulmonary embolism more often presents with pleuritic chest pain, tachycardia, hypoxemia, and usually lacks prominent wheeze. Heart failure typically produces crackles, orthopnea/PND, and volume overload findings rather than isolated expiratory wheeze. Asthma can wheeze, but in a 55-year-old with established COPD, a COPD flare is more consistent with the clinical picture.
Category reason: This question tests differential diagnosis based on respiratory symptoms and a known COPD history, which is foundational clinical knowledge about respiratory conditions rather than a nursing intervention or prioritization task.

Train with a large NCLEX question bank and jump into a full exam-style simulator

Respiratory System NCLEX Practice Test

Continue Learning