( Excretion ( ( ( is primarily ) ( ( renal ( by ( glomerular filtration ) ) ) ( with ( ( ( minimal ( tubular secretion ) ) or ) reabsorption ) ) ) ) . ) )
(ROOT (S (NP (NNP Excretion)) (VP (VBZ is) (ADVP (RB primarily)) (VP (VBG renal) (PP (IN by) (NP (NN glomerular) (NN filtration))) (PP (IN with) (NP (NP (JJ minimal) (JJ tubular) (NN secretion)) (CC or) (NP (NN reabsorption)))))) (. .)))
Excretion is primarily renal by glomerular filtration with minimal tubular secretion or reabsorption.
(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)))))) (. .)))