Select the correct statement from the following.
a. Double-layered membrane with pleural fluid between the two layers.
b. Pleural fluid reduces friction on the lung surface.
c. The outer pleural membrane is in close contact with the lung surface.

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only a and b

only b

only c

a, b and c

answer is C.

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Detailed Solution

Lungs are covered by a double layered pleura, with pleural fluid between them. It reduces friction on the lung-surface. The outer pleural membrane is in close contact with the thoracic lining whereas the inner pleural membrane is in contact with the lung surface.

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