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Example Questions
Example Question #11 : Respiratory System
What is the primary and unique role of surfactant in the lungs?
Possible Answers:
Disinfecting the interior of the lungs
Waterproofing the interior of the lungs
Lowering the surface tension of alveoli
All of these answers
Lubricating the bronchioles
Correct answer:
Lowering the surface tension of alveoli
Explanation:
Alveoli, like most bodily structures, are part of an aqueous environment, making them subject to the surface tension of water. Surfactant lowers surface tension, allowing the alveoli to expand with much less pressure than they would against full surface tension. As a result, inspiration of air requires less effort, making it more energetically efficient.
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