Parietal and visceral layers of the pleura.

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Multiple Choice

Parietal and visceral layers of the pleura.

Two-layer pleura arrangement: the parietal pleura lines the inside of the thoracic cavity (the chest wall, diaphragm, and mediastinum), while the visceral pleura tightly covers the surface of the lungs. The space between them, the pleural cavity, contains a small amount of fluid to reduce friction during breathing. That’s why the correct description is parietal pleura lining the thoracic cavity and visceral pleura covering the lungs. The other options mix up which layer lines which structure or apply the layer to the wrong organ, which isn’t how the pleura is organized.

Two-layer pleura arrangement: the parietal pleura lines the inside of the thoracic cavity (the chest wall, diaphragm, and mediastinum), while the visceral pleura tightly covers the surface of the lungs. The space between them, the pleural cavity, contains a small amount of fluid to reduce friction during breathing. That’s why the correct description is parietal pleura lining the thoracic cavity and visceral pleura covering the lungs. The other options mix up which layer lines which structure or apply the layer to the wrong organ, which isn’t how the pleura is organized.

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