( ( Loss ( of consciousness ) ) ( typically ( ( ( ( ( involves injuries ) ( to ( the ( brain stem ) ) ) ) , ) ( ( the ( oldest part ) ) ( of ( ( ( the brain ) , ) ( which ( is ( responsible ( for ( ( basic ( fife functions ) ) ( such ( as ( ( alertness , ) ( arousal ( , ( heartbeat ( , ( and breathing ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NN Loss)) (PP (IN of) (NP (NN consciousness)))) (ADVP (RB typically)) (VP (VBZ involves) (NP (NNS injuries)) (PP (TO to) (NP (DT the) (NN brain) (NN stem))) (, ,) (NP (NP (DT the) (JJS oldest) (NN part)) (PP (IN of) (NP (NP (DT the) (NN brain)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (JJ basic) (NN fife) (NNS functions)) (PP (JJ such) (IN as) (NP (NP (NNS alertness)) (, ,) (NP (NN arousal) (, ,) (NN heartbeat) (, ,) (CC and) (NN breathing)))))))))))))) (. .)))
Loss of consciousness typically involves injuries to the brain stem, the oldest part of the brain, which is responsible for basic fife functions such as alertness, arousal, heartbeat, and breathing.
(ROOT (S (NP (DT The) (NN brain) (NN stem)) (VP (VBZ regulates) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN breathing))))) (. .)))