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, air-filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure.
D. It is a closed sac surrounding each lung and contains a large volume of surfactant.
E. It is bounded by pleural membranes that are very thin, which allows for abundant gas exchange.


Answer: B

Anatomy & Physiology

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