Respiratory System MCQs

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1. Which structure serves as the main site of gas exchange?



2. Which muscle is the primary muscle of breathing?



3. The normal respiratory rate in adults is:



4. Which lung has two lobes?



5. Surfactant is secreted by:



6. Which gas mainly regulates respiration?



7. Which part of the brain controls basic rhythm of respiration?



8. What is the normal tidal volume in adults?



9. Which structure prevents food from entering trachea?



10. Which lung volume cannot be measured by spirometry?



11. Which law explains the pressure-volume relationship in breathing?



12. Which nerve supplies the diaphragm?



13. Which structure is known as the “windpipe”?



14. The left lung has how many lobes?



15. What is the approximate alveolar surface area in adult lungs?



16. The conducting zone of respiratory tract includes:



17. Oxygen is transported in blood primarily:



18. Cyanosis becomes clinically evident when oxygen saturation falls below:



19. Which pleura directly covers the lungs?



20. The lung volume left after normal expiration is:



21. Which condition is characterized by destruction of alveoli?



22. Which test is used to measure lung volumes and capacities?



23. Which gas diffuses fastest across alveolar membrane?



24. Which respiratory disease is due to Mycobacterium tuberculosis?



25. Which structure separates thoracic cavity from abdominal cavity?



26. Which condition shows a barrel-shaped chest?



27. Which is a restrictive lung disease?



28. The majority of CO₂ is carried in blood as:



29. Which respiratory sound is typical in asthma?



30. Which structure is called the voice box?



31. Which condition is caused by lack of surfactant in newborns?



32. Which type of pneumothorax is life-threatening?



33. Which law explains diffusion of gases in alveoli?



34. Which gas law describes partial pressures of gases?



35. Which structure is the narrowest part of airway in children?



36. Which lung disease shows “honeycomb lung” on CT?



37. Which condition is defined as collapse of alveoli?



38. Which respiratory center responds primarily to hypoxia?



39. Which lung disease is known as “blue bloater”?



40. Which is known as “pink puffer”?



41. Which condition shows consolidation in lungs?



42. Which condition involves air in pleural cavity?



43. Which condition is characterized by fluid in pleural space?



44. Which is the gold standard test for pulmonary embolism?



45. Which breathing pattern is deep and labored, seen in DKA?



46. Which gas has the highest solubility in blood?



47. Which respiratory parameter is reduced in obstructive disease?



48. Which condition shows productive cough for >3 months/year, 2 consecutive years?



49. Which lung disease commonly affects miners due to coal dust?



50. Which test measures arterial oxygen saturation non-invasively?



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