Select the incorrect statement from the following.

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Each lung is covered by a double-layered pleura.

The outer parietal pleura lines the wall of the thoracic cavity.

The inner visceral pleura covers the lung surface.

The pleural fluid increases friction between the parietal and visceral pleura.

answer is D.

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Detailed Solution

We have two lungs which are covered by a double layered pleura, with pleural fluid between them. The outer pleural membrane is in close contact with the thoracic lining whereas the inner pleural membrane is in contact with the lung surface. The pleural fluid reduces friction between the membranes, allowing them to slide easily over one another during breathing. Pleural fluid also causes the two membranes to adhere to one another just as a film of water causes two glass microscope slides to stick together, a phenomenon called surface tension.

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