( ( ( The ( three parts ) ) ( of ( the brain ) ) ) ( ( ( stem collectively ) ( regulate ( ( ( vital ( body functions ) ) , ) ( such ( as ( ( ( ( ( ( ( ( ( respiration , ) ( blood pressure ) ) , ) ( heart rate ) ) , ) ( GI functioning ) ) , ) and ) ( stages ( of ( ( sleep and ) wakefulness ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD three) (NNS parts)) (PP (IN of) (NP (DT the) (NN brain)))) (VP (VBP stem) (ADVP (RB collectively)) (VP (VB regulate) (NP (NP (JJ vital) (NN body) (NNS functions)) (, ,) (PP (JJ such) (IN as) (NP (NP (NN respiration)) (, ,) (NP (NN blood) (NN pressure)) (, ,) (NP (NN heart) (NN rate)) (, ,) (NP (NNP GI) (NNP functioning)) (, ,) (CC and) (NP (NP (NNS stages)) (PP (IN of) (NP (NN sleep) (CC and) (NNS wakefulness))))))))) (. .)))
The three parts of the brain stem collectively regulate vital body functions, such as respiration, blood pressure, heart rate, GI functioning, and stages of sleep and wakefulness.
(ROOT (S (NP (DT The) (NN brain) (NN stem)) (VP (VBZ regulates) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN breathing))))) (. .)))