what is normally found in the pericardial and pleural spaces of normal individuals?
In normal individuals, the pericardial space contains a small amount of fluid called pericardial fluid. This fluid helps to reduce friction between the layers of the pericardium during heartbeats.
On the other hand, the pleural spaces (one on each side of the chest) contain a small amount of pleural fluid. This fluid helps to lubricate and reduce friction between the lungs and the chest wall during breathing, allowing the lungs to expand and contract smoothly.