Alveolar surfactant is

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(C) Alveolar surfactant is a complex mixture of lipids and proteins that lines the inner surface of the alveoli in the lungs.Its primary function is t

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Lipoprotein

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(C) Alveolar surfactant is a complex mixture of lipids and proteins that lines the inner surface of the alveoli in the lungs.Its primary function is to reduce the surface tension of the fluid lining the alveoli,which prevents the collapse of the alveoli during expiration.The most significant component of pulmonary surfactant is dipalmitoylphosphatidylcholine $(DPPC)$,a phospholipid,along with specific surfactant proteins ($SP$-$A$,$SP$-$B$,$SP$-$C$,and $SP$-$D$).Therefore,it is classified as a lipoprotein complex.

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