The diagram of the pulmonary pleura illustrates the structure of the pleural membrane that surrounds and protects the lungs within the chest cavity. First, the pleura is a thin membrane that plays important roles in the respiratory system. In addition, it allows the lungs to move smoothly during breathing.
The pulmonary pleura consists of two main layers. On one hand, the visceral pleura directly covers the surface of the lungs. On the other hand, the parietal pleura lines the inner wall of the chest cavity.
Between these two layers lies a small space called the pleural cavity. Moreover, this cavity contains a small amount of pleural fluid. Because of this fluid, the pleural layers can slide smoothly against each other.
During inhalation, the lungs expand inside the chest cavity. Then, the pleurae of the lungs allow this expansion to occur with minimal friction. As a result, the lungs increase in volume to receive oxygen.
Meanwhile, during exhalation, the lungs contract and release carbon dioxide. Therefore, the pleura helps maintain the natural movement of the lungs.
Furthermore, the pulmonary pleura also has a protective role. For example, it keeps the lungs properly positioned within the chest. Likewise, it helps prevent lung collapse.
The pleural fluid also plays an important role because it reduces friction between the pleural layers. For this reason, breathing movements occur efficiently.
In conclusion, the diagram of the pulmonary pleura helps explain how this membrane protects the lungs and supports their movement during breathing.