ANATOMY

Detailed explanation-1: -Pleural fluid is a liquid that is located between the layers of the pleura. The pleura is a two-layer membrane that covers the lungs and lines the chest cavity. Pleural fluid keeps the pleura moist and reduces friction between the membranes when you breathe.

Detailed explanation-2: -The thin space between the two pleural layers is known as the pleural cavity and normally contains a small amount of pleural fluid.

Detailed explanation-3: -The pleural cavity is a space between the visceral and parietal pleura. The space contains a tiny amount of serous fluid, which has two key functions. The serous fluid continuously lubricates the pleural surface and makes it easy for them to slide over each other during lung inflation and deflation.

Detailed explanation-4: -Therefore, as you breathe, the pleural fluid prevents the two layers of the pleura from rubbing against each other and causing damage due to friction.

Detailed explanation-5: -Because the pleura is self-contained, it can help prevent the spread of infection to and from the lungs.