Biologyhard · Past Paper
What is the function of 'Surfactant' in the alveoli?
AIncreasing surface tension
BReducing surface tension to prevent collapse
CFacilitating CO2 transport
DKilling bacteria
✓ Correct Answer: B — Reducing surface tension to prevent collapse
Pulmonary surfactant reduces the surface tension at the air-water interface in the alveoli, preventing them from collapsing.
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