( ( ( MEDULLA -- ) ( ( ( a structure ) ( in ( the ( brain stem ) ) ) ) ( that ( controls ( ( vital functions ) ( such ( as ( ( ( ( ( ( heart rate ) , ) breathing ) , ) and ) ( blood pressure ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP MEDULLA)) (: --) (NP (NP (DT a) (NN structure)) (PP (IN in) (NP (DT the) (NN brain) (NN stem))) (SBAR (WHNP (WDT that)) (S (VP (VBZ controls) (NP (NP (JJ vital) (NNS functions)) (PP (JJ such) (IN as) (NP (NP (NN heart) (NN rate)) (, ,) (NP (NN breathing)) (, ,) (CC and) (NP (NN blood) (NN pressure))))))))) (. .)))
MEDULLA -- a structure in the brain stem that controls vital functions such as heart rate, breathing, and blood pressure.
(ROOT (S (NP (DT The) (NN brain) (NN stem)) (VP (VBZ regulates) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN breathing))))) (. .)))