👉 Suck fluid, also known as serous fluid or pleural fluid, is a clear, colorless liquid that fills the spaces between the lungs and the chest wall, specifically within the pleural cavity. It serves as a lubricant for smooth movement of the lungs against the ribcage during breathing and also helps maintain the negative pressure in the pleural space, which is crucial for effective lung expansion. This fluid is produced by both the visceral pleura (lining the lungs) and the parietal pleura (lining the chest wall). Under normal conditions, the amount of suck fluid is minimal, but it can increase in certain pathological states such as pleural effusion or pneumothorax, where an excess of fluid accumulates, potentially disrupting normal respiratory function.
