The ______________ is a double layered membrane that lines the lungs.

Question

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The pleura of the lungs is composed of two layers of tissue that separate the lungs from the thoracic cavity. There as an inner visceral pleura which lines all of the folds of the lungs, and an outer parietal pleura. A pleural cavity exists between the two layers of the pleura.
The pericardium is the lining of the heart.
An alveolus is a single air sac that makes up the alveoli, where the majority of gas exchange occurs in the lung.
You may use the diagram below as a visual reference for the structures referenced in this question.
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The ______________ Is a Double Layered Membrane That Lines the Lungs