( Well ( , ( ( your blood ) ( ( relies ( on ( ( four ( special valves ) ) ( inside ( the heart ) ) ) ) ) . ) ) ) )
(ROOT (S (INTJ (UH Well)) (, ,) (NP (PRP$ your) (NN blood)) (VP (VBZ relies) (PP (IN on) (NP (NP (CD four) (JJ special) (NNS valves)) (PP (IN inside) (NP (DT the) (NN heart)))))) (. .)))
Well, your blood relies on four special valves inside the heart.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))