Lines the outer surface of the lungs.

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Multiple Choice

Lines the outer surface of the lungs.

Explanation:
The outer surface of the lungs is covered by the visceral pleura. This membrane directly clings to the lung tissue, following its contours and fissures. The parietal pleura, by contrast, lines the inner chest wall, diaphragm, and mediastinum, forming the other side of the pleural cavity—the potential space between the two pleura that contains a small amount of fluid to reduce friction. The visceral pericardium lines the heart, not the lungs. So the correct lining for the lungs’ outer surface is the visceral pleura.

The outer surface of the lungs is covered by the visceral pleura. This membrane directly clings to the lung tissue, following its contours and fissures. The parietal pleura, by contrast, lines the inner chest wall, diaphragm, and mediastinum, forming the other side of the pleural cavity—the potential space between the two pleura that contains a small amount of fluid to reduce friction. The visceral pericardium lines the heart, not the lungs. So the correct lining for the lungs’ outer surface is the visceral pleura.

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