Surfactant lining the alveoli
Correct Answer: Helps prevent alveolar collapse.
Description: The low surface tension when the alveoli are small is due to the presence in the fluid lining the alveoli of surfactant, a lipid surface-tension-lowering agent. If the surface tension is not kept low when the alveoli become smaller during expiration, they collapse in accordance with the law of Laplace.
Category:
Physiology
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