( ( ( ( Approximately 5 ) % ) ( of ( saliva ( entering ( the ( oral cavity ) ) ) ) ) ) ( ( come ( from ( these glands ) ) ) . ) )
(ROOT (S (NP (NP (QP (RB Approximately) (CD 5)) (NN %)) (PP (IN of) (NP (NP (NN saliva)) (VP (VBG entering) (NP (DT the) (JJ oral) (NN cavity)))))) (VP (VBP come) (PP (IN from) (NP (DT these) (NNS glands)))) (. .)))
Approximately 5% of saliva entering the oral cavity come from these glands.
(ROOT (S (NP (NNP Saliva) (NNP secretion)) (VP (VBZ initiates) (NP (NN chemical) (NN digestion)) (PP (IN while) (S (ADVP (RB also)) (VP (VBG protecting) (NP (DT the) (JJ oral) (NN cavity)))))) (. .)))