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Q.

Pleural fluid helps in 

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a

reducing friction between lung membranes

b

lubrication of vocal cords for speech

c

transport of oxygen from the lungs

d

removal of dust particles from the lungs

answer is A.

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Detailed Solution

The lungs are enveloped by a dual-layered pleura, separated by pleural fluid, which serves to minimise friction on the lung surface. The outer pleural membrane closely adheres to the thoracic lining, while the inner pleural membrane makes direct contact with the lung surface.

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