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The pleural membranes that surround the lungs serve what purpose?
Secrete mucus to trap dust particles
Generate a negative pressure to facilitate lung expansion
Regulate the temperature of the lungs
Facilitate the production of surfactant
Answers (1)
The pleural membranes, consisting of the visceral pleura (covering the lungs) and the parietal pleura (lining the thoracic cavity), serve the purpose of facilitating lung expansion. These membranes create a closed sac known as the pleural cavity, which is filled with a small amount of serous fluid. This fluid allows the visceral and parietal pleurae to slide smoothly against each other during breathing. The negative pressure generated within the pleural cavity by the opposing forces of the elastic recoil of the lungs and the tendency of the chest wall to spring outwards helps maintain the lung's inflation and expansion. This negative pressure is crucial for keeping the lungs in close contact with the chest wall, allowing efficient exchange of gases during respiration.
Hence, the correct answer is option 2.
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