Question

Function of pleural fluid is–

• A. Provide support
• B. Prevent infection
• C. Form membranous layer
• D. Reduces friction

Answer 1

The correct option is D Reduces friction

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.

So, the correct answer is option 'd'.