( Blood ( first ( ( ( enters ( the heart ) ) ( at ( ( ( the ( right atrium ) ) , ) ( which ( then ( ( empties blood ) ( into ( ( ( the ( right ventricle ) ) , ) ( which ( ( ( pumps ( the blood ) ) ( into ( the lungs ) ) ) ( through ( the ( pulmonary ( artery ( to ( get oxygen ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Blood)) (ADVP (RB first)) (VP (VBZ enters) (NP (DT the) (NN heart)) (PP (IN at) (NP (NP (DT the) (JJ right) (NN atrium)) (, ,) (SBAR (WHNP (WDT which)) (S (ADVP (RB then)) (VP (VBZ empties) (NP (NN blood)) (PP (IN into) (NP (NP (DT the) (JJ right) (NN ventricle)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD pumps) (NP (DT the) (NN blood)) (PP (IN into) (NP (DT the) (NNS lungs))) (PP (IN through) (NP (DT the) (JJ pulmonary) (NN artery) (S (VP (TO to) (VP (VB get) (NP (NN oxygen)))))))))))))))))) (. .)))
Blood first enters the heart at the right atrium, which then empties blood into the right ventricle, which pumps the blood into the lungs through the pulmonary artery to get oxygen.
(ROOT (S (NP (NP (NNP Blood)) (PP (IN from) (NP (DT the) (NN body)))) (VP (VBZ enters) (NP (NP (JJ right) (NN atrium)) (PP (IN of) (NP (DT the) (NN heart)))) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN pumped) (PP (PP (TO to) (NP (DT the) (JJ right) (NN ventricle))) (CC and) (RB then) (PP (TO to) (NP (DT the) (NNS lungs))))))))) (. .)))