( ( maintains ( homeostasis ( of ( pH ( in ( body fluids ) ) ) ) ) ) . )
(ROOT (S (VP (VBZ maintains) (NP (NP (NNS homeostasis)) (PP (IN of) (NP (NP (NN pH)) (PP (IN in) (NP (NN body) (NNS fluids))))))) (. .)))
maintains homeostasis of pH in body fluids.
(ROOT (S (NP (NP (NNP Processing)) (PP (IN of) (NP (NP (NN filtrate)) (PP (IN in) (NP (DT the) (JJ proximal) (NN tubule)))))) (VP (VBZ helps) (VP (VB maintain) (NP (DT the) (NN ph) (NN level)) (PP (IN in) (NP (NN body) (NN fluid))))) (. .)))