( ( ( The ( third division ) ) ( of ( ( ( ( the ( autonomic ( nervous system ) ) ) , ) ( the ( enteric system ) ) ) , ) ) ) ( ( ( ( ( ( is primarily ) ( involved ( in ( ( ( ( ( ( ( ( controlling ( gastrointestinal motility ) ) , ) ( gastric secretion ) ) , ) ( fluid transport ) ) , ) etc. ) , ) ) ) ) and ) therefore ) ( clearly ( ( plays ( a ( central role ) ) ) ( in ( maintaining homeostasis ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ third) (NN division)) (PP (IN of) (NP (NP (DT the) (JJ autonomic) (JJ nervous) (NN system)) (, ,) (NP (DT the) (JJ enteric) (NN system)) (, ,)))) (VP (VP (VBZ is) (ADVP (RB primarily)) (VP (VBN involved) (PP (IN in) (NP (NP (JJ controlling) (JJ gastrointestinal) (NN motility)) (, ,) (NP (JJ gastric) (NN secretion)) (, ,) (NP (JJ fluid) (NN transport)) (, ,) (FW etc.) (, ,))))) (CC and) (ADVP (RB therefore)) (VP (ADVP (RB clearly)) (VBZ plays) (NP (DT a) (JJ central) (NN role)) (PP (IN in) (S (VP (VBG maintaining) (NP (NNS homeostasis))))))) (. .)))
The third division of the autonomic nervous system, the enteric system , is primarily involved in controlling gastrointestinal motility, gastric secretion, fluid transport, etc., and therefore clearly plays a central role in maintaining homeostasis.
(ROOT (S (NP (DT The) (JJ nervous) (NN system)) (VP (VBZ plays) (NP (NP (DT a) (JJ critical) (NN role)) (PP (IN in) (NP (NP (DT the) (NN regulation)) (PP (IN of) (NP (NN vascular) (NNS homeostasis))))))) (. .)))