Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 48)
What is the function of surfactant in the alveoli?
To facilitate gas exchange.
To reduce surface tension and prevent alveolar collapse.
To filter out dust particles.
To humidify the air.
Explanation
Surfactant reduces surface tension, making it easier for the alveoli to inflate and preventing them from collapsing.
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