9. How the pleural sac holds the lungs open

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4 Terms

1
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What is the pleural sac?

a sealed, fluid-filled space between the parietal and visceral pleura

2
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The lungs naturally recoil _, while the chest wall tends to recoil _, which causes _.

inward, outward, subatmospheric intrapleural pressure

3
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What causes the lungs to open?

The pleural fluid causes the lungs to stick to the chest wall so the expansion of the thorax causes the lungs to open

4
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What is transpulmonary pressure?

alveolar pressure - intrapleural pressure (+ value that keeps lungs open)