Answer :
It is false to say that lung alveoli produce pleural fluid.
Why do intrapulmonary and intrapleural pressures differ?
The lungs flex and expand in response to the expansion of the thoracic cavity due to the adhesive force of the pleural fluid. The intra-alveolar pressure decreases as a result of the volume increase, bringing the pressure down to atmospheric levels.
Which pressure, intrapulmonary or intrapleural, is always higher?
When breathing in, the intrapulmonary pressure is lower than the atmospheric pressure, and when breathing out, it is higher. In order for the lungs to remain inflated, the intrapleural pressure is typically always lower than the intrapulmonary pressure.
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