which is true about the pleural sac? A. it is a closed sac surrounding eeach lun

Question

which is true about the pleural sac? A. it is a closed sac surrounding eeach lung and contains a large volume of surfactant B. it is a closed air filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure c. it is continuous with the atmosphere and proects the lungs from infection d. it is bounded by pleural membranes that are very thin, which allows for abundant gas exchange e. it is a closed sac surrounding each lung that contains only a tiny volume volume of lubricating fluid

Explanation / Answer

It is true about the pleural sac that the Pleural sac is a closed sac surrounding each lung that contains only a tiny volume volume of lubricating fluid

The pleural cavity is the potential space between the two pleurae (visceral-parietal) of the lungs. The pleura is a serous membrane which folds back onto itself to form a two-layered membrane structure. The thin space is known as the pleural cavity and contains a small amount of pleural fluid (few milliliters in a normal human). The pleural cavity aids optimal functioning of the lugs during breathing. It transmits movements of the chest wall to the lungs, particularly during heavy breathing. The closely approved chest wall transmits pressures to the visceral pleural surface and therefore to the lung

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