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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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ronswanson11 ronswanson11
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6 years ago
Which of the following statements best conveys an aspect of the respiratory pressures that govern ventilation?
 
  A)
  Intrapleural pressure slightly exceeds that of the inflated lung.
  B)
  The chest wall exerts positive pressure on the lungs that contributes to expiration.
  C)
  The lungs are prevented from collapsing by constant positive intrapulmonary pressure.
  D)
  Negative intrapleural pressure holds the lungs against the chest wall.
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wrote...
#1
6 years ago
Ans:
D

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Negative intrapleural pressure holds the lungs in place against the chest wall and prevents their natural elastic properties from causing them to collapse. Intrapleural pressure is negative in relation to the inflated lung, and the chest wall exerts negative pressure on the lungs that keeps them from contracting and contributes to inspiration. Intrapulmonary pressure oscillates between positive and negative relative to atmospheric pressure with expiration and inspiration.
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