Respiratory Physiology Practice Questions

12 Questions | Total Attempts: 1080

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Respiratory Physiology Practice Questions - Quiz

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Questions and Answers
  • 1. 
    A patient was evaluated in a pulmonary function laboratory. At residual volume, a 2.5 l bag was attached to the patient’s mouthpiece. The bag contained 0.8% He. The patient breathed into and out of the bag for 2 minutes, after which the He concentration in the bag was measured and found to be 0.55%. The patient’s residual volume was:
    • A. 

      0.9 l

    • B. 

      1.08 l

    • C. 

      1.14 l

    • D. 

      1.22 l

  • 2. 
    A woman was evaluated in a whole body plethysmograph on a day when the barometric pressure was 752 mmHg. At residual volume, she inspired against a closed mouthpiece and airway pressure fell to 724 mmHg. During this inspiratory maneuver, 120 ml of air was expelled from the phethysmograph. Her residual volume was:
    • A. 

      2.1 l

    • B. 

      2.8 l

    • C. 

      3.1 l

    • D. 

      3.8 l

  • 3. 
    An elderly man tripped and fell down a flight of steps, breaking a rib which caused a pneumothorax. If you were to measure the circumference of this man’s chest, you would expect it to be:
    • A. 

      Larger than normal

    • B. 

      Normal

    • C. 

      Smaller than normal.

    • D. 

      Cannot predict without additional information.

  • 4. 
    A coal miner went to his local clinic for chronic shortness of breath. His arterial oxygen saturation was 76% (below normal) and his esophageal pressure, an estimate of intrapleural pressure, was normal. In addition, his FEV1/FRC was 0.8. His residual volume was probably:
    • A. 

      Below normal

    • B. 

      Normal

    • C. 

      Above normal

  • 5. 
    A premature baby with difficulty breathing probably has:
    • A. 

      An increased FRC.

    • B. 

      An increased TLC

    • C. 

      A decreased RV

    • D. 

      A and C.

  • 6. 
    Chest X-rays of patients with emphysema show an elongated mediastinum. This is the result of:
    • A. 

      Elastase breaking down the covering of the mediastinum.

    • B. 

      Descent of the floor of the diaphragm

    • C. 

      Cardiac failure

  • 7. 
    Contraction of the abdominal muscles is important in
    • A. 

      Normal (quiet) inspiration.

    • B. 

      Forced (maximum) inspiration

    • C. 

      Normal (quiet) expiration.

    • D. 

      Forced (maximum) expiration.

    • E. 

      None of the above.

  • 8. 
    Alveolar surfactant acts to increase pulmonary
    • A. 

      Surface tension.

    • B. 

      Compliance.

    • C. 

      Airway resistance.

  • 9. 
    In emphysema, which of the following would be expected to be below normal (less positive or more negative than normal)?
    • A. 

      Airway resistance

    • B. 

      Lung compliance

    • C. 

      Intrapleural pressure

    • D. 

      FEV1

    • E. 

      B, C, and D above

  • 10. 
    Residual volume of 2.5 liters is:
    • A. 

      Above normal

    • B. 

      Below normal

    • C. 

      Within the normal range

  • 11. 
    Respiratory Ventilation Predicted Measured Measure after bronchodilator Vital Capacity 3.3 L 2.3 L 2.4 L Residual Volume 0.8 L 0.6 L 0.6 L Total Lung Capacity 4.1 L 2.9 L 3.0 L FEV-1 2.6 L 1.9 L 2.0 L FEV-1 / FVC > 80% 83% 83%  The following measurements were taken on a 23 year old female with a recent history of dyspnea and cyanosis on exertion. This patient has:
    • A. 

      A restrictive disease

    • B. 

      An obstructive disease.

    • C. 

      A combined obstructive/restrictive disease

  • 12. 
    Spirometry can be used to measure:
    • A. 

      FRC.

    • B. 

      RV

    • C. 

      TLC

    • D. 

      FVC

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