Questions: Which of the following pressures must remain negative to prevent lung collapse? Atmospheric pressure Thoracic wall Parietal pleura Visceral pleura Pleural cavity Transpulmonary pressure Diaphragm Intrapulmonary pressure intrapleural pressure atmospheric pressure intrapulmonary pressure

Which of the following pressures must remain negative to prevent lung collapse? Atmospheric pressure Thoracic wall Parietal pleura Visceral pleura Pleural cavity Transpulmonary pressure Diaphragm Intrapulmonary pressure intrapleural pressure atmospheric pressure intrapulmonary pressure
Transcript text: Which of the following pressures must remain negative to prevent lung collapse? Atmospheric pressure Thoracic wall Parietal pleura Visceral pleura Pleural cavity Transpulmonary pressure Diaphragm Intrapulmonary pressure intrapleural pressure atmospheric pressure intrapulmonary pressure
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Solution

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Solution Steps

Step 1: Identify the Question

The question asks which of the following pressures must remain negative to prevent lung collapse.

Step 2: Understand the Pressures

The diagram shows different pressures related to the lungs:

  • Atmospheric pressure (Patm): 0 mm Hg (760 mm Hg)
  • Intrapulmonary pressure (Ppul): 0 mm Hg (760 mm Hg)
  • Intrapleural pressure (Pip): -4 mm Hg (756 mm Hg)
  • Transpulmonary pressure: 4 mm Hg (the difference between Ppul and Pip)
Step 3: Determine the Correct Pressure

To prevent lung collapse, the intrapleural pressure (Pip) must remain negative. This negative pressure keeps the lungs expanded by creating a suction effect that opposes the natural tendency of the lungs to recoil and collapse.

Final Answer

The pressure that must remain negative to prevent lung collapse is the intrapleural pressure (Pip).

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