The lubricating secretions of the walls of the thoracic cavity and the outsides of the lungs come from goblet cells.

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Quizplus · Accepted Answer

The lubricating secretions of the walls of the thoracic cavity and the outsides of the lungs come from pleural fluid, which is produced by the pleural membrane and not goblet cells. Goblet cells are found primarily in the respiratory passages and produce mucus to protect the respiratory tract from pathogens and other harmful substances.

The Lubricating Secretions of the Walls of the Thoracic Cavity