25 Important Respiratory System MCQ Questions and Answers

25 Important Respiratory System MCQ Questions and Answers

  1. In which part of the respiratory system, gaseous exchange takes place?

    (a) Alveoli
    (c) Larynx
    (b) Pharynx
    (d) Trachea

  2. _____is located between two pleural sacs and is the central compartment of the thoracic cavity?

    (a) Hilum
    (b) Pleura
    (c) Mediastinum
    (d) Thoracic cage

  3. Which of the following statements is true about involuntary breathing?

    (a) It is controlled by the bronchioles
    (b) It is controlled by the pulmonary arterioles
    (c) It is controlled by the alveolar-capillary network
    (d) It is controlled by the neurons, located in the medulla and pons

  4. Which of the following are parts of the human respiratory system?

    (a) Trachea
    (b) Diaphragm
    (c) The lungs
    (d) All of the above

  5. Which of the following gas is released out during the process of respiration?

    (a) Oxygen
    (b) Hydrogen
    (c) Carbon dioxide
    (d) None of the above

  6. The tiny air sacs present man lungs are called

    (a) Alveoli
    (b) Bronchus
    (c) Bronchioles
    (d) All of the above

  7. Which of the following functions by filtering and keeping the mucus and dirt away from our lungs?

    (a) Cilia
    (b) Bronchioles
    (c) Hairs in the lungs
    (d) All of the above

  8. The total number of alveoli present in the human lungs is estimated to be around

    (a) 1 billion
    (b) 800 million
    (c) 500 million
    (d) 1500 million

  9. The exchange of gases between the external environment and the lungs

    (a) Respiration
    (b) External respiration
    (c) Cellular respiration
    (d) None of the above

  10. Which one of the following statements is false about the trachea?

    (a) Has C-shaped rings
    (b) It is covered by epiglottis
    (c) It splits into the right and left lungs
    (d) None of the above

  11. The maximum volume of air contained in the lung by a full forced inhalation is called

    (a) Tidal volume
    (b) Vital capacity
    (c) Ventilation rate
    (d) Total lung capacity

  12. Which one of the following is correct regarding the larynx?

    (a) It houses the vocal cords
    (b) It prevents the invading pathogens into the trachea
    (c) It is an organ made of cartilage and connects the pharynx to the trachea
    (d) All of the above

  13. Which of the following is the function of the trachea?

    (a) Gaseous Exchange
    (b) Filters the air we breathe
    (c) Exhales the air from the body
    (d) All of the above

  14. Which of these statements is true about internal respiration?

    (a) Production of ATP
    (b) Exchange of gases between the bloodstream and tissue cells
    (c) Exchange of gases between alveoli and the bloodstream
    (d) Breathing between the atmosphere and the alveoli

  15. Which of the following organs functions as an air conditioner?

    (a) Larynx
    (b) Pharynx
    (c) Nasal chambers
    (d) All of the above

  16. The gas which stimulates respiration is

    (a) Nitrogen
    (b) Oxygen
    (c) Carbon dioxide

  17. The maximum amount of air that can be expired after the deepest inspiration is called

    (a) Vital capacity
    (b) Tidal volume
    (c) Peak inspiratory volume

  18. Lecithin is a substance present in

    (a) Oropharynx
    (b) Bronchial tubes
    (c) Alveoli

  19. Smoking is one of the causes of

    (a) Hypoxia
    (b) Emphysema
    (c) Narcosis

  20. The most important factor in determining the percent oxygen saturation of hemoglobin is

    (a) The partial pressure of O₂
    (b) Acidity
    (c) The partial pressure of CO₂

  21. The internal lining of the trachea has a membrane of

    (a) Ciliated endothelium
    (b) Squamous epithelium
    (c) Connective tissue cells
    (d) Mucous cells

  22. The mediastinum is the name of

    (a) Left lung
    (b) Cartilage in the larynx
    (c) Fold in between the Lungs
    (d) Covering on the lungs

  23. During normal breathing, the amount of air that moves into the lungs and comes out is called

    (a) IRV
    (b) Residual volume
    (c) ERV
    (d) TV

  24. PO₂ stands for:

    (a) Pure oxygen
    (b) Partial oxygen
    (c) Pressure of oxygen
    (d) Partial pressure of oxygen

  25. Conchae are present in the

    (a) Cardiac notch
    (b) Voicebox
    (c) Diaphragm
    (d) Nasal cavity

  26. FAQ about Respiratory System

    Read Frequently Asked Questions

  27. Covering the membrane of the lungs is


  28. C-shaped cartilaginous rings are present in

    Trachea, Bronchi and Bronchioles

  29. Difficulty in breathing is termed as


  30. The thyroid cartilage of the larynx is also called

    Adams’ Apple

  31. A deficiency of oxygen at the tissue level is called


  32. Above normal partial pressure of CO₂ is called


  33. Rapid and deep breathing is called


  34. The total volume of air inhaled and exhaled each minute is called

    Minute Ventilation

  35. The volume of air in one breath is called

    Tidal Volume

  36. The amount of air exhaled in forced exhalation is called

    Expiratory Reserve Volume (ERV)

  37. The respiratory organs are

    Nose, Pharynx, Larynx, Trachea, Bronchi, Bronchioles, and Lungs

  38. The internal portion of the nose communicates with the nasopharynx through the

    Internal Nares

  39. The anterior part of the nasal cavity is called the


  40. Three anatomic regions of the pharynx are

    Nasopharynx, Oropharynx, and Laryngopharynx

  41. The cartilage which connects the larynx and trachea is called the

    Cricoid Cartilage

Also Read: 26 IMP Lymphatic System MCQ Questions and Answers

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