What ensures that the lungs expand as the chest wall expands? A. secreted surfactant B. negative pressure between the pleura C. serous liquid secreted by the pleura D. the elastic recoil of the alveolar tissue
Option B. Negative pressure (suction) causes the visceral pleura to stay in touch with the parietal pleura, so that once the chest wall & parietal pleura moves, the parietal pleura takes the visceral pleura and lungs with it.
