Which Is TRUE About the Pleural Sac

question 31

Multiple Choice

Which is TRUE about the pleural sac?

• A)It is continuous with the atmosphere and protects the lungs from infection.
• B)It is a closed sac surrounding each lung that contains only a tiny volume of lubricating fluid.
• C)It is a closed sac surrounding each lung and contains a large volume of surfactant.
• D)It is a closed,air-filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure.
• E)It is bounded by pleural membranes that are very thin,which allows for abundant gas exchange.

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