( ( ( ( ( Oxygen decreases ) , ) ( ( ( carbon ( dioxide increases ) ) , ) ( the blood ) ) ) ( ( becomes ( more ( ( ( ( acidic , ) ( ( the heart ) ( rate drops ) ) ) and ) ( blood vessels ) ) ) ) ( in ( the ( lung constrict ) ) ) ) ) ( , ( '' ( ( says Umlauf ) . ) ) ) )
(ROOT (SINV (S (NP (NP (NN Oxygen) (NNS decreases)) (, ,) (NP (NP (NN carbon) (NN dioxide) (NNS increases)) (, ,) (NP (DT the) (NN blood)))) (VP (VBZ becomes) (NP (JJR more) (NX (NX (NX (NNS acidic)) (, ,) (NP (NP (DT the) (NN heart)) (NP (NN rate) (NNS drops)))) (CC and) (NX (NN blood) (NNS vessels)))) (PP (IN in) (NP (DT the) (NN lung) (NN constrict))))) (, ,) ('' '') (VP (VBZ says)) (NP (NNP Umlauf)) (. .)))
Oxygen decreases, carbon dioxide increases, the blood becomes more acidic, the heart rate drops and blood vessels in the lung constrict,&quot; says Umlauf.
(ROOT (S (NP (NNP Blood)) (VP (VBP flow) (VP (VB decrease) (SBAR (WHADVP (WRB when)) (S (NP (NN blood) (NNS vessels)) (VP (VBP constrict)))))) (. .)))