( ( From ( the ( right atrium ) ) ) ( ( the blood ) ( ( ( flows ( through ( the ( tricuspid valve ) ) ) ) ( into ( ( the ( right ventricle ) ) ( that ( serves ( to ( ( pump blood ) ( to ( ( the lungs ) ( for ( ( the exchange ) ( of gases ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN From) (NP (DT the) (JJ right) (NN atrium))) (NP (DT the) (NN blood)) (VP (VBZ flows) (PP (IN through) (NP (DT the) (JJ tricuspid) (NN valve))) (PP (IN into) (NP (NP (DT the) (JJ right) (NN ventricle)) (SBAR (WHNP (WDT that)) (S (VP (VBZ serves) (S (VP (TO to) (VP (VB pump) (NP (NN blood)) (PP (TO to) (NP (NP (DT the) (NNS lungs)) (PP (IN for) (NP (NP (DT the) (NN exchange)) (PP (IN of) (NP (NNS gases)))))))))))))))) (. .)))
From the right atrium the blood flows through the tricuspid valve into the right ventricle that serves to pump blood to the lungs for the exchange of gases.
(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)))) (. .)))