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Pleural fluid reduces friction between the lung surface and the thoracic cavity during breathing. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Pleural fluid reduces friction and helps maintain lung expansion but does not directly facilitate gas exchange.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
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