A) to provide some rigidity to the alveoli to prevent lung collapse
B) to decrease the surface tension of the alveoli, making it easier to expand them
C) to facilitate the diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] by providing protein channels through which these gases flow
D) to provide a sticky surface upon which dust and microbes are trapped and disposed of
Correct Answer: B
Solution :
[b] Thin layer of water on the inner sun-face of alveoli serves to contract the alveoli and makes them behave like unfilled balloons that resist inflation. This would mean tremendous effort to inhale and expand the alveoli and therefore to overcome this cells of the alveoli secrete pulmonary surfactant to decrease the surface tension of water lining the alveoli.
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