alleryStart learning →Which cells secrete pleural fluid, and what does that fluid do?
AGoblet cells, and it traps inhaled debris
BType II cells, and it lowers surface tension
CMesothelial cells, and it lubricates the pleurae
DAlveolar cells, and it equalises air pressure
Answer & Solution
Correct answer: C. Mesothelial cells, and it lubricates the pleurae
1. Pleural fluid sits in the pleural cavity between the two pleural layers.
2. It is secreted by mesothelial cells from both layers.
3. It lubricates their surfaces and so reduces friction during breathing, making the third option correct.
4. Type II alveolar cells make surfactant to lower alveolar surface tension, which is a different fluid at a different site.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.2 The Lungs_
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