Pressure in Occluded Alveoli Quiz
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Questions and Answers

During normal inspiration, what is the average pleural pressure?

  • -7.5 cm of water (correct)
  • -1 cm of water
  • 0 cm of water
  • -5 cm of water
  • In normal inspiration, what happens to the pleural pressure from -5 to -7.5 cm of water?

  • Remains constant
  • Increases (correct)
  • Fluctuates
  • Decreases
  • What is the value of alveolar pressure during normal inspiration?

  • +1 cm of water
  • +7.5 cm of water
  • -1 cm of water (correct)
  • -7.5 cm of water
  • How does the alveolar pressure change during expiration?

    <p>Rises to +1 cm of water</p> Signup and view all the answers

    What is the effect of alveolar radius on pressure during inspiration?

    <p>Increased radius causes decreased pressure</p> Signup and view all the answers

    To pull air into the alveoli during inspiration, what must the pressure in the alveoli be in relation to atmospheric pressure?

    <p>Below atmospheric pressure</p> Signup and view all the answers

    What happens to the pressure in occluded alveoli due to surface tension?

    <p>It increases, attempting to push the air out.</p> Signup and view all the answers

    How does the radius of an alveolus affect the pressure generated by surface tension?

    <p>The smaller the alveolus, the greater the alveolar pressure.</p> Signup and view all the answers

    What is the significance of having small alveoli in premature babies?

    <p>Many have alveoli with radii much smaller than adult alveoli.</p> Signup and view all the answers

    What happens to lung expansibility when the thoracic cage is considered?

    <p>Muscular effort is required even if lungs are absent in the thorax.</p> Signup and view all the answers

    How is the compliance of the entire pulmonary system measured?

    <p>By expanding the lungs of a fully relaxed individual.</p> Signup and view all the answers

    What effect does a half-normal radius have on alveolar pressure caused by surface tension?

    <p>It doubles the pressure compared to normal size.</p> Signup and view all the answers

    What is the pressure in all parts of the respiratory tree, including the alveoli, when the glottis is open and no air is flowing?

    <p>Atmospheric pressure</p> Signup and view all the answers

    What does transpulmonary pressure represent?

    <p>Pressure difference between alveoli and pleural pressure</p> Signup and view all the answers

    Which term describes the extent to which the lungs will expand for each unit increase in transpulmonary pressure?

    <p>Lung compliance</p> Signup and view all the answers

    What is the purpose of a compliance diagram of the lungs as described in the text?

    <p>Relating lung volume changes to transpulmonary pressure changes</p> Signup and view all the answers

    In what direction do the elastic forces of the lungs tend to move during respiration?

    <p>Collapse the lungs</p> Signup and view all the answers

    How would an increase in alveolar radius affect pressure in occluded alveoli?

    <p>Decrease pressure</p> Signup and view all the answers

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