What is the role of surfactant in respiration?

Answer 1

The main function of pulmonary surfactants is to reduce the surface tension at the air/liquid interface in the lungs.

This is achieved by forming a surface film that consists of a mono layer which is highly enriched in dipalmitoylphosphatidylcholine and bilayer lipid/protein structure closely attached to it.

Pulmonary surfactant is a mixture of lipids and proteins which is secreted by the epithelial type II cells into the alveolar space.

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Answer 2

Logan Allen

By keeping the alveoli open during exhalation and lowering surface tension, surfactants facilitate effective gas exchange by keeping the alveoli open.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.