What is the function of pleural fluid in the respiratory system?

What is the function of pleural fluid in the respiratory system?
  1. To reduce friction on the lung surface
  2. To regulate body temperature
  3. To humidify the air
  4. To transport atmospheric air

Solution

Pleural fluid, which is present between the two lungs and is covered by a double-layered pleura, reduces friction on the lung surface.

Asked in: NCERT

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