Final answer:
The pleural cavity is the space between the lung and the parietal pleura.
Step-by-step explanation:
The pleural cavity is the space between the lung and d. Parietal pleura. The pleura, which is a serous membrane surrounding the lungs, consists of two layers: the visceral pleura, which is superficial to the lungs, and the parietal pleura, which is the outer layer connecting to the thoracic wall, the mediastinum, and the diaphragm. The space between these two layers is known as the pleural cavity, which contains a small amount of pleural fluid acting as a lubricant to reduce friction during breathing.