( ( ( ( Blood , ) ( depleted ( in oxygen ) ) ) , ) ( ( ( flows ( from ( the veins ) ) ) ( ( ( ( into ( the ( right atrium ) ) ) , ) then ) ( to ( the ( right ( ventricle ( to ( be ( ( pumped ( through ( the ( pulmonary artery ) ) ) ) ( to ( the lungs ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Blood)) (, ,) (VP (VBN depleted) (PP (IN in) (NP (NN oxygen)))) (, ,)) (VP (VBZ flows) (PP (IN from) (NP (DT the) (NNS veins))) (PP (PP (IN into) (NP (DT the) (JJ right) (NN atrium))) (, ,) (RB then) (PP (TO to) (NP (DT the) (JJ right) (NN ventricle) (S (VP (TO to) (VP (VB be) (VP (VBN pumped) (PP (IN through) (NP (DT the) (JJ pulmonary) (NN artery))) (PP (TO to) (NP (DT the) (NNS lungs))))))))))) (. .)))
Blood, depleted in oxygen, flows from the veins into the right atrium, then to the right ventricle to be pumped through the pulmonary artery to the lungs.
(ROOT (S (NP (NP (DT The) (JJ right) (NN atrium)) (PP (IN of) (NP (DT the) (JJ human) (NN heart)))) (VP (VBD pumps) (NP (DT the) (NN blood)) (PP (TO to) (NP (DT the) (JJ right) (NN ventricle)))) (. .)))