Which membrane covers the surface of the lung?

• A. Visceral pleura
• B. Parietal pleura
• C. Pericardium
• D. Endothelium

Answer: (A)

The surface of the lung is covered by the visceral pleura. This membrane directly adheres to the lung tissue, forming the inner layer of the pleural sacs. The parietal pleura, by contrast, lines the chest wall and diaphragm, while the pericardium encases the heart, and endothelium lines blood vessels and heart chambers. The two pleural layers create a small pleural cavity with fluid that helps reduce friction during breathing.