Respiratory System Quiz: Lung Functions and Pressure Gradients
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Questions and Answers

What causes air to move in or out of the lungs and maintains lung inflation?

  • Flow gradients
  • Volume gradients
  • Temperature gradients
  • Pressure gradients (correct)

    • What is the definition of lung compliance?

  • Change in lung recoil resulting from a unit of pressure change
  • Change in lung volume resulting from a unit of pressure change (correct)
  • Change in airway resistance resulting from a unit of pressure change
  • Change in elastance resulting from a unit of pressure change

    • In stiff lungs, what is the relationship between elasticity and compliance?

  • The more elastic the lung, the more its compliance
  • The more elastic the lung, the less its compliance
  • The less elastic the lung, the less its compliance (correct)
  • The less elastic the lung, the more its compliance

    • Which condition is characterized by a loss of elastic lung tissue?

    <p>Emphysema</p> Signup and view all the answers

    What is the normal value of lung compliance?

    <p>0.2 L/cm H2O</p> Signup and view all the answers

    What is the result of a high recoil force in the lungs?

    <p>Lungs are difficult to inflate</p> Signup and view all the answers

    What is the main reason why patients with pulmonary fibrosis adopt a rapid, shallow breathing strategy?

    <p>Minimizing work due to high elastic recoil</p> Signup and view all the answers

    What is the term for the conducting airways from the mouth and nose down to and including terminal bronchioles?

    <p>Anatomical dead space</p> Signup and view all the answers

    What is the approximate amount of anatomical dead space in normal adults?

    <p>1 mL/pound IBW</p> Signup and view all the answers

    What is the approximate PAO2 of a person breathing room air at sea level, with a PaCO2 equal to 40 mm Hg and an R equal to 0.8?

    <p>Approximately 100 mm Hg</p> Signup and view all the answers

    Which of the following conditions can increase the length of the diffusion path?

    <p>I, II, III</p> Signup and view all the answers

    What is the primary function of the anatomical dead space?

    <p>Conducting air</p> Signup and view all the answers

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