👉 The close fluid, also known as pleural fluid, is a clear, colorless liquid found in the spaces between the lungs and the lining of the chest cavity, known as the pleura. This fluid plays a crucial role in lubrication and reducing friction during breathing, allowing the lungs to expand and contract smoothly. It also helps maintain the negative pressure within the pleural cavity, which is essential for keeping the lungs inflated. The volume of close fluid typically ranges from 5 to 10 milliliters, and its composition closely matches that of blood plasma, with small amounts of proteins and electrolytes. Any significant changes in the amount or quality of close fluid can indicate underlying respiratory or cardiovascular issues, making its analysis important in medical diagnostics.
