What is the lungs covered in membrane on a pig?

The lungs of a pig, like those of other mammals, are covered by a double-layered membrane called the pleura. The outer layer, known as the parietal pleura, lines the chest cavity, while the inner layer, the visceral pleura, directly covers the lungs. This pleural membrane facilitates smooth movement of the lungs during respiration and helps maintain pressure differences necessary for breathing. Additionally, it produces pleural fluid, which reduces friction between the lung surfaces and the chest wall.