( ( This muscle ) ( ( plays ( ( an ( important role ) ) ( in ( respiration ( , ( ( swallowing and ) speech ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN muscle)) (VP (VBZ plays) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (NN respiration) (, ,) (NN swallowing) (CC and) (NN speech))))) (. .)))
This muscle plays an important role in respiration, swallowing and speech.
(ROOT (S (NP (NP (DT The) (NN structure)) (PP (IN of) (NP (NN mitochondrion)))) (VP (VBZ plays) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (JJ aerobic) (NN respiration))))) (. .)))