What is the main function of pleural fluid?
Correct answer: B. Reduce friction during lung movement
- A. Digest particles entering the bronchi
- B. Reduce friction during lung movement
- C. Carry oxygen from alveoli to tissues
- D. Produce surfactant inside the alveoli
Explanation
A thin layer of pleural fluid lubricates the pleural surfaces and allows the lungs to move smoothly during breathing. Surfactant is produced by type II alveolar cells, not by the pleura.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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