Choose the INCORRECT statement regarding to the human lungs:

Synovial fluid reduces friction on the lung-surface.

The correct answer is Option (2) - Synovial fluid reduces friction on the lung-surface.

The branching network of bronchi, bronchioles and alveoli comprise the lungs. We have two lungs which 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.

Synovial fluid is a thick fluid located between the joints.