Answer:
The function of the pleura is to allow optimal expansion and contraction of the lungs during breathing. The pleural fluid acts as a lubricant, allowing the parietal and visceral pleura to glide over each other friction free. This fluid is produced by the pleural layers themselves.
This occurs during protein synthesis. This is because the cell continues to protein synthesise, therefore adding to the amount of cells.
I hope this helps.
Enzymes is a phycical protein folding.