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  4. Friction on the lungs is surface reduced by

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Q. Friction on the lungs is surface reduced by

Breathing and Exchange of Gases

Solution:

Humans have a pair of lung, each of which is covered by a double membrane called pleura,with pleural fluid between them. Pleural fluid reduces the friction on the lung surface. The outer pleural membrane is in close contact with the thoracic lining whereas the inner pleural membrane is in the contact with the lung surface.