Your lungs are covered by a remarkable two-layer membrane called the pleura.
The visceral pleura closely covers the lungs, while the parietal pleura lines the inner chest wall and diaphragm. Between them is a tiny amount of pleural fluid that helps the surfaces move smoothly. The pleural space also normally maintains negative pressure, helping keep the lungs expanded during breathing.
In this Body Spectra 3D animation, discover how these nearly invisible layers help your lungs move with your chest during every breath.
