Physiology Functional Anatomy - Respiratory System 7ffe2d13 Major constituent of surfactant is - A Dipalmitoyl lecithine B Dipalmitoyl cephaline C Dipalmitoyl serine D Dipalmitoyl inositol High-Yield Explanation Ans. is 'a' i.e., Dipalmitoyl lecithin o The major (65%) constituent of surfactant is dipalmitoylphosphatidylcholine (dipalmitoyl-lecithin); which is a phospholipid.