( ( The ( blood vessels ) ) ( ( are ( ( the part ) ( of ( ( the ( circulatory system ) ) ( that ( ( transports blood ) ( throughout ( the ( human body ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN blood) (NNS vessels)) (VP (VBP are) (NP (NP (DT the) (NN part)) (PP (IN of) (NP (NP (DT the) (JJ circulatory) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (VBZ transports) (NP (NN blood)) (PP (IN throughout) (NP (DT the) (JJ human) (NN body)))))))))) (. .)))
The blood vessels are the part of the circulatory system that transports blood throughout the human body.
(ROOT (S (NP (NP (DT A) (NN relationship)) (PP (IN between) (NP (CD two) (JJ human) (NN body) (NNS systems)))) (VP (MD could) (VP (VB be) (NP (NP (DT the) (JJ digestive) (NN system)) (SBAR (S (VP (VBZ absorbs) (NP (NP (NNS nutrients)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN transported) (PP (IN by) (NP (DT the) (JJ circulatory) (NN system)))))))))))))) (. .)))