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  4. In mammals, pleural membranes cover the lungs as well as insides of the ribcage. The pleural fluid in between the two membranes

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Q. In mammals, pleural membranes cover the lungs as well as insides of the ribcage. The pleural fluid in between the two membranes

KVPYKVPY 2012

Solution:

Pleural fluid is a serous fluid produced by the serous membrane covering normal pleurae. The pleural fluid acts as a lubricant and allows the pleurae to slide effortlessly against each other during respiratory movements, thus reducing the friction between the ribs and the lungs.