Friction on the lung surface is reduced by:

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(A) Humans have two lungs,which are covered by a double membrane called the pleura,with pleural fluid present between them.This pleural fluid acts as

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Double layered pleura

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(A) Humans have two lungs,which are covered by a double membrane called the pleura,with pleural fluid present between them.This pleural fluid acts as a lubricant and reduces the friction on the lung surface during breathing movements.The outer pleural membrane is in close contact with the thoracic lining,whereas the inner pleural membrane is in contact with the lung surface.

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