👉 The soldier fluid, also known as pleural fluid, is a clear or colorless liquid that fills the space between the lungs and the chest wall, known as the pleural cavity. It plays a crucial role in maintaining the negative pressure within this cavity, which is essential for lung expansion during breathing. This fluid acts as a lubricant, reducing friction between the lungs and the chest wall during inhalation and exhalation. Its composition is similar to that of blood plasma but contains less protein, which helps prevent excessive fluid accumulation. When the balance between fluid production and reabsorption is disrupted, conditions like pleural effusion or pleural effusion can occur, affecting respiratory function.
