What is the potential space between the visceral and parietal pleura of the lungs called?

• A. Mediastinum
• B. Alveolar space
• C. Pericardial space
• D. Pleural cavity

Answer: (D)

The space between the visceral pleura (covering the lungs) and the parietal pleura (lining the chest wall) is called the pleural cavity. It’s a potential space that normally contains a small amount of lubricating pleural fluid, creating a negative pressure that helps keep the lungs expanded and allows smooth movement during breathing. The other options refer to different structures: the mediastinum is the central thoracic compartment containing the heart and vessels; the alveolar space is inside the alveoli where gas exchange occurs; the pericardial space surrounds the heart. Thus, the correct name for that space is the pleural cavity.