What structure do human lungs have?

A person has two lungs. They are located in the chest cavity of the body and are covered with a membrane – pulmonary pleura. The pleura covers the inner surface of the chest cavity (parietal pleura), and then passes to the lung. Between the parietal and pulmonary pleura there is a gap – pleural cavity. It is filled with pleural fluid, which reduces the friction of the lungs against the walls of the chest cavity during breathing. Each lung is in a hermetically enclosed space.

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