( Heart ( ( ( pumps blood ) ( through ( ( a system ) ( of ( blood vessels ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Heart)) (VP (VBD pumps) (NP (NN blood)) (PP (IN through) (NP (NP (DT a) (NN system)) (PP (IN of) (NP (NN blood) (NNS vessels)))))) (. .)))
Heart pumps blood through a system of blood vessels.
(ROOT (S (NP (NP (DT The) (JJ cardiovascular) (NN system)) (PP (IN in) (NP (DT the) (JJ human) (NN body)))) (VP (VBZ consists) (PP (IN of) (NP (NP (DT the) (NN heart)) (, ,) (NP (NP (DT a) (NN network)) (PP (IN of) (NP (NN blood) (NNS vessels)))) (, ,) (CC and) (NP (NN blood))))) (. .)))