( ( ( Filtration and ) humidification ) ( ( ( are also ) ( ( primary functions ) ( of ( ( the ( mucous blanket ) ) ( ( ( secreted ( by ( ( ( surface ( goblet cells ) ) and ) ( mucosal glands ) ) ) ) and ) ( covering ( the ( ciliary epithelium ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Filtration) (CC and) (NN humidification)) (VP (VBP are) (ADVP (RB also)) (NP (NP (JJ primary) (NNS functions)) (PP (IN of) (NP (NP (DT the) (JJ mucous) (NN blanket)) (VP (VP (VBN secreted) (PP (IN by) (NP (NP (NN surface) (NN goblet) (NNS cells)) (CC and) (NP (JJ mucosal) (NNS glands))))) (CC and) (VP (VBG covering) (NP (DT the) (JJ ciliary) (NN epithelium)))))))) (. .)))
Filtration and humidification are also primary functions of the mucous blanket secreted by surface goblet cells and mucosal glands and covering the ciliary epithelium.
(ROOT (S (NP (NP (DT The) (JJ main) (NNS functions)) (PP (IN of) (NP (NN epithelia)))) (VP (VBP are) (NP (NP (NN protection)) (PP (IN from) (NP (NP (DT the) (NN environment) (, ,) (NN coverage) (, ,) (NN secretion) (CC and) (NN excretion)) (, ,) (NP (NN absorption)) (, ,) (CC and) (NP (NN filtration)))))) (. .)))