( Blood ( ( is ( ( pumped ( through ( the chambers ) ) ) ( with ( ( the help ) ( of ( four ( heart valves ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Blood)) (VP (VBZ is) (VP (VBN pumped) (PP (IN through) (NP (DT the) (NNS chambers))) (PP (IN with) (NP (NP (DT the) (NN help)) (PP (IN of) (NP (CD four) (NN heart) (NNS valves))))))) (. .)))
Blood is pumped through the chambers with the help of four heart valves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))