<prompt> Meibomian glands secrete which component of sweat?Water aqueousMucinProteinLipid  <response>: Ans. is d i.e., Lipid The major function of lacrimal apparatus is to secrete and drain the tear. Tear film consists of 3 layers :- Mucous or mucin layer innermost:- Secreted by conjunctival goblet cells, crypts of Henle, glands of Manz. Aqueous layer intermediate :- This forms the bulk of the tear. It is secreted by main lacrimal and accessory lacrimal glands. Lipid layer outermost :- Secreted by the Meibomion Zeis, and Moll glands. 