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Question 1. Which structure is primarily responsible for conducting air from the nasal cavity to the bronchi? A) Trachea B) Larynx C) Pharynx D) Upper airway (nose, pharynx, larynx) Answer: D Explanation: The upper airway includes the nose, pharynx, and larynx, which conduct air from the external environment towards the lower airway; their primary function is conduction, but they also condition the inspired air. Question 2. Which of the following is a common pathology affecting airflow in the upper airway? A) Emphysema B) Nasal polyps C) Pulmonary fibrosis D) Pulmonary embolism Answer: B
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Explanation: Nasal polyps are a common pathology of the upper airway that can obstruct airflow and cause nasal obstruction. Question 3. The conducting zone of the lower airway includes all except: A) Trachea B) Alveoli C) Bronchi D) Bronchioles Answer: B Explanation: The alveoli are part of the respiratory zone, responsible for gas exchange, whereas the conducting zone includes the trachea, bronchi, and bronchioles. Question 4. Which lung lobe is located in the right upper region? A) Left upper lobe B) Right middle lobe C) Right upper lobe D) Right lower lobe
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Explanation: The diaphragm is the primary muscle for inspiration, contracting and flattening during inhalation to increase thoracic volume. Question 7. Which neural structure primarily controls the automatic regulation of breathing? A) Cerebral cortex B) Respiratory centers in the brainstem C) Spinal cord D) Peripheral nerves Answer: B Explanation: The respiratory centers located in the medulla oblongata and pons regulate involuntary breathing patterns. Question 8. What role do peripheral chemoreceptors play in respiratory control? A) Detect changes in blood pH B) Detect oxygen levels C) Detect carbon dioxide levels D) Detect stretch in the lungs
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Answer: B Explanation: Peripheral chemoreceptors, located in the carotid and aortic bodies, primarily respond to changes in blood oxygen levels to regulate ventilation. Question 9. According to Fick's Law, gas diffusion rate is directly proportional to: A) Surface area and partial pressure difference B) Thickness of membrane C) Molecular weight of gas D) Blood flow rate Answer: A Explanation: Fick's Law states that the rate of diffusion increases with greater surface area and higher partial pressure differences across the membrane. Question 10. Which lung volume represents the maximum amount of air that can be exhaled after a maximal inhalation? A) Tidal Volume (VT) B) Vital Capacity (VC)
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B) Length C) Viscosity D) Pressure difference Answer: A Explanation: Resistance is proportional to 1/radius^4, meaning small decreases in airway radius significantly increase resistance. Question 13. Lung compliance is primarily affected by: A) Surface tension and elastic properties B) Airway resistance C) Blood oxygen levels D) Chest wall rigidity Answer: A Explanation: Lung compliance depends on tissue elasticity and surface tension within alveoli, affecting the ease of lung inflation. Question 14. V/Q matching refers to: A) The balance between ventilation and perfusion B) The ratio of tidal volume to inspiratory reserve
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C) The proportion of dead space D) The ratio of residual volume to total lung capacity Answer: A Explanation: Ventilation-perfusion (V/Q) matching assesses the balance between airflow to alveoli and blood flow in pulmonary capillaries for optimal gas exchange. Question 15. Boyle’s Law states that, at constant temperature, pressure and volume are: A) Directly proportional B) Inversely proportional C) Unrelated D) Equal Answer: B Explanation: Boyle’s Law states that pressure decreases as volume increases, and vice versa, at constant temperature. Question 16. Which gas law explains the relationship between temperature and volume at constant pressure? A) Boyle's Law
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B) Gloves only C) Mask, gloves, and gown D) Standard precautions including gloves and mask Answer: D Explanation: Standard precautions, including gloves and masks, are necessary to prevent infection transmission during testing. Question 19. Which of the following is a key component of patient coaching during spirometry? A) Encouraging rapid, forceful exhalation B) Instructing slow, gentle breathing C) Suppressing cough during exhalation D) Ensuring consistent effort and maximal exhalation Answer: D Explanation: Proper coaching emphasizes consistent effort and maximal exhalation to obtain valid and reproducible results. Question 20. The FEV1/FVC ratio in healthy adults is typically: A) Less than 70%
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B) Greater than 80% C) Equal to 100% D) Less than 50% Answer: B Explanation: In healthy adults, the FEV1/FVC ratio is generally greater than 80%, indicating unobstructed airflow. Question 21. Which of the following is an acceptable criterion indicating a valid spirometry maneuver? A) Cough during the maneuver B) Glottis closure C) No leakage or extra breaths D) Inconsistent effort Answer: C Explanation: Valid maneuvers require no leakage, no cough, consistent effort, and proper technique. Question 22. When interpreting spirometry, a reduced FEV1 with a normal or increased FEV1/FVC ratio suggests:
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Question 24. A significant increase in FEV1 after bronchodilator administration indicates: A) Fixed airway obstruction B) Reversible airway obstruction C) Restrictive pattern D) Normal lung function Answer: B Explanation: Reversibility with bronchodilators suggests asthma or other reversible obstructive conditions. Question 25. In flow-volume loops, a scooped-out or concave shape on expiratory limb indicates: A) Obstructive airway disease B) Restrictive disease C) Normal airflow D) Fixed large airway obstruction Answer: A Explanation: The characteristic scooped-out appearance suggests airflow limitation typical of obstructive diseases like asthma.
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Question 26. Body plethysmography measures: A) Only residual volume B) Only total lung capacity C) Multiple lung volumes including FRC, TLC, RV D) Only diffusion capacity Answer: C Explanation: Body plethysmography allows measurement of multiple lung volumes including FRC, TLC, and RV based on Boyle's Law. Question 27. The nitrogen washout technique primarily involves: A) Dilution of nitrogen to measure FRC B) Measuring gas exchange across alveolar membrane C) Using helium as a tracer gas D) Calculating lung compliance Answer: A Explanation: Nitrogen washout involves inhaling pure oxygen to wash out nitrogen, allowing FRC determination based on dilution.
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Question 30. Which abnormal lung volume pattern suggests air trapping? A) Decreased residual volume B) Increased residual volume and total lung capacity C) Decreased total lung capacity D) Increased functional residual capacity only Answer: B Explanation: Air trapping leads to increased residual volume and total lung capacity, typical in obstructive disease. Question 31. DLCO measures: A) Gas exchange efficiency across alveolar-capillary membrane B) Lung compliance C) Airway resistance D) Lung volumes Answer: A Explanation: Diffusing capacity (DLCO) assesses how effectively gases like carbon monoxide diffuse across the alveolar-capillary membrane.
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Question 32. The single-breath DLCO technique involves: A) Continuous inhalation of helium B) Inhalation of a CO mixture, breath hold, and gas sampling C) Tidal breathing with nitrogen washout D) Exhalation into a spirometer Answer: B Explanation: The single-breath method involves inhaling a gas mixture containing CO, holding breath, then sampling to measure gas uptake. Question 33. Factors that decrease DLCO include all EXCEPT: A) Anemia B) Pulmonary hypertension C) Smoking D) Polycythemia Answer: D Explanation: Polycythemia increases hemoglobin concentration, which can increase DLCO; anemia decreases it.
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Question 36. Which of the following is a typical feature of restrictive lung disease on spirometry? A) Reduced FEV1/FVC ratio B) Increased residual volume C) Reduced FVC with normal or increased FEV1/FVC ratio D) Obstructive pattern with scooped flow-volume loop Answer: C Explanation: Restrictive diseases feature decreased FVC with preserved or increased FEV1/FVC ratio. Question 37. Which lung volume measurement assesses the amount of air remaining in the lungs after maximum exhalation? A) Tidal Volume B) Residual Volume C) Inspiratory Reserve Volume D) Vital Capacity Answer: B Explanation: Residual Volume is the amount of air remaining after forceful exhalation, preventing alveolar collapse.
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Question 38. The main advantage of nitrogen washout over body plethysmography is: A) Better accuracy in obstructive disease B) Simpler and more portable equipment C) Measures residual volume directly D) Less affected by ventilation heterogeneity Answer: B Explanation: Nitrogen washout is simpler and more portable but less accurate in air trapping compared to body plethysmography. Question 39. Which of the following best describes the relationship between lung compliance and elastic recoil? A) Increased compliance leads to increased elastic recoil B) Increased compliance leads to decreased elastic recoil C) Compliance and recoil are unrelated D) Both decrease in restrictive disease Answer: B
