The pleura is a vital structure in the human body that plays a crucial role in respiration. It consists of two thin layers, the visceral and parietal pleura, which surround the lungs and line the chest cavity, respectively. The pleura helps to protect and cushion the lungs, while also allowing them to expand and contract during breathing. This double-layered membrane creates a fluid-filled space, the pleural cavity, which enables smooth movement and reduces friction between the lungs and the chest wall. The pleura's function is essential for efficient and effortless breathing, ensuring the proper functioning of the respiratory system.

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