👉 Respiratory fluid, also known as pleural fluid, is a clear, colorless, and slightly yellowish liquid that fills the spaces between the lungs and the inner surface of the pleural membranes, which line the chest cavity. This fluid plays a crucial role in lubricating the lung surfaces and reducing friction during breathing, allowing for smooth and efficient expansion and contraction of the lungs. It also helps maintain the negative pressure within the pleural cavity, which is essential for keeping the lungs inflated. The balance of fluid production and absorption ensures that the fluid level remains stable, typically around 5 to 10 milliliters per chest cavity, facilitating optimal respiratory function.
