One of the following statements is correct. Which one? A. The visceral pleura is attached to the chest wall and the parietal pleura is attached to the lung. B. The two lungs and their associated structures are known as the pneumothorax. C. The hilum is a serous membrane that surrounds each lung separately. D. A negative pressure is maintained between the two lung pleura.
Option D. The parietal pleura (connected to the chest wall) and the visceral pleura (connected to the lung) are in very near touch but “separated” through pleural fluid inside which there's a pressure this is much less than atmospheric pressure (i.e. negative). This manner that the lungs are caught to the chest wall and expand when it does.
