Sem 1, Pulmonary Mechanics Practice Questions

14 Questions | Total Attempts: 501

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Sem 1, Pulmonary Mechanics Practice Questions

In the human body, the word “pulmonary” is related to the lungs and the respiratory system, and is mainly linked to the process of having air move in and out of the lungs. What do you know about these mechanics?


Questions and Answers
  • 1. 
    A patient is suffering from obstructive lung disease.  Values of compliance for his chest wall and respiratory system are known as: Chest wall compliance (CCW) = 200 ml / cm H2O Respiratory system compliance (CRW) = 100 ml / cm H2O What is his Lung compliance (CL) in ml / cm H2O?  
    • A. 

      50

    • B. 

      100

    • C. 

      200

    • D. 

      300

    • E. 

      400

  • 2. 
    A patient inhales 2 L of air and holds his breath. At the beginning of inspiration his lung transmural pressure is – 5 cm H2O. During breath holding his lung transmural pressure is – 10 cm H2O. What is his lung compliance in L / cm H2O?
    • A. 

      0.1

    • B. 

      0.2

    • C. 

      0.3

    • D. 

      0.4

    • E. 

      0.5

  • 3. 
    By which combination of the following respiratory pattern is the alveolar ventilation (VA) the greatest?                                     Tidal volume (VT)                Respiratory frequency (f)                                                 (L)                                    (breath / min)
    • A. 

      0.25 24

    • B. 

      0.5 12

    • C. 

      1.0 6

    • D. 

      2.0 3

  • 4. 
    Physiological dead space calculated by Bohr equation is:
    • A. 

      Always greater than anatomical dead space

    • B. 

      Always smaller than anatomical dead space

    • C. 

      Always equal to anatomical dead space

    • D. 

      Either greater or equal to anatomical dead space

    • E. 

      Either smaller or equal to anatomical dead space

  • 5. 
    What is the volume of one mol ideal gas under STPD condition:
    • A. 

      10.5 L

    • B. 

      15.2 L

    • C. 

      22.4 L

    • D. 

      31.0 L

    • E. 

      36.4 L

  • 6. 
    A gas mixture of several dry gases has a total pressure of 200 mm Hg and a total gas amount of 10 Mol. What is the partial pressure of one gas that has an amount 3 Mol?
    • A. 

      20 mm Hg

    • B. 

      30 mm Hg

    • C. 

      40 mm Hg

    • D. 

      50 mm Hg

    • E. 

      60 mm Hg

  • 7. 
    By a routine examination of respiratory functions a spirometer is used to measure lung volumes. Which lung volume or lung capacity can not be determined by this method?
    • A. 

      Inspiratory reserve volume (IRV)

    • B. 

      Inspiratory capacity (IC)

    • C. 

      Expiratory reserve volume (ERV)

    • D. 

      Vital capacity (VC)

    • E. 

      Total lung capacity (TLC)

  • 8. 
    A Patient consults the doctor and complains over breathlessness. The doctor thinks he is suffering from lung emphysema. Therefore he decides to measure the residual volume of the lung. After a maximal expiration, the Patient is connected with a bag containing a mixture of 2 liters air ( Vbag = 2 l) with 2% He (FHe = 0.02). Helium concentration decreases to 1% (FHe = 0.01) after mixing of lung volume with the volume of the bag. What is the residual volume of the patient?
    • A. 

      0.5 L

    • B. 

      1.0 L

    • C. 

      1.5 L

    • D. 

      2.0 L

    • E. 

      3.0 L

  • 9. 
    The compliance of the respiratory system is changing with lung volume. Close to which lung volume has the respiratory system it´s greatest compliance?
    • A. 

      FRC

    • B. 

      RV

    • C. 

      TLC

    • D. 

      Minimal lung volume (below RV)

  • 10. 
    A patient has a skeletal abnormality (Kyphoscoliosis). You are interested to verify the compliance of his chest wall. You are measuring changes in lung volume by a spirometer. Which pressure change you have to measure in addition to ΔV to be able to determine the compliance of his chest wall?
    • A. 

      Changes in alveolar pressure (ΔPA)

    • B. 

      Changes in intra pleural pressure (ΔPPl)

    • C. 

      Changes in airway pressure (ΔPaw)

    • D. 

      Changes in alveolar O2-partial pressure (ΔPAO2)

    • E. 

      Changes in inspired O2-partial pressure (ΔPIO2)

  • 11. 
    You are called to examine a premature early born infant. He is suffering from breathlessness and is cyanotic.  Your diagnosis is “infant respiratory distress syndrome, IRDS). After treatment with artificial surfactant, the situation is under control. What did surfactant do?
    • A. 

      It decreased the lung compliance

    • B. 

      It decreased surface tension in the lung

    • C. 

      It increased the force of respiratory muscles

    • D. 

      It increased the activity of inspiratory motoneurons

    • E. 

      It increased the concentration of erythrocytes in the blood

  • 12. 
    Some of diseases cause injury of alveolar surface (gas exchange region). Which type of the lung cells repairs this membrane?
    • A. 

      Alveolar epithel cell type I

    • B. 

      Alveolar epithel cell type II

    • C. 

      Alveolar macrophage

    • D. 

      Brush cell

    • E. 

      Clara cell

  • 13. 
    Force of respiratory muscles is dependent on lung volume. At which lung volume have the expiratory muscles their greatest force?
    • A. 

      Minimal lung volume (resting volume of the lung)

    • B. 

      RC

    • C. 

      FRC

    • D. 

      60% of VC

    • E. 

      TLC

  • 14. 
    A person connected to a spirometer has been asked to take a maximum breath in, hold it and then exhale as hard and fast as he can (forced vital capacity manoeuvre). The expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) have been measured. The value of FEV1/FVC is significantly below 80 % by
    • A. 

      A healthy person

    • B. 

      Lung obstructive disease

    • C. 

      Lung restrictive disease

    • D. 

      Lung fibrosis