( ( If ( ( ( the ( flow rate ) ) ( of ( blood ( through ( the lungs ) ) ) ) ) ( becomes ( great enough ) ) ) ) ( , ( ( a point ) ( ( is ( reached ( where ( ( ( the ( de-oxygenated blood ) ) ( coming ( from ( ( the ( right ventricle ) ) ( of ( the heart ) ) ) ) ) ) ( is ( ( passing ( through ( the lungs ) ) ) ( before ( it ( is ( fully ( re-saturated ( with oxygen ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN flow) (NN rate)) (PP (IN of) (NP (NP (NN blood)) (PP (IN through) (NP (DT the) (NNS lungs)))))) (VP (VBZ becomes) (ADJP (JJ great) (RB enough))))) (, ,) (NP (DT a) (NN point)) (VP (VBZ is) (VP (VBN reached) (SBAR (WHADVP (WRB where)) (S (NP (NP (DT the) (JJ de-oxygenated) (NN blood)) (VP (VBG coming) (PP (IN from) (NP (NP (DT the) (JJ right) (NN ventricle)) (PP (IN of) (NP (DT the) (NN heart))))))) (VP (VBZ is) (VP (VBG passing) (PP (IN through) (NP (DT the) (NNS lungs))) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ is) (ADJP (RB fully) (JJ re-saturated) (PP (IN with) (NP (NN oxygen))))))))))))) (. .)))
If the flow rate of blood through the lungs becomes great enough, a point is reached where the de-oxygenated blood coming from the right ventricle of the heart is passing through the lungs before it is fully re-saturated with oxygen.
(ROOT (S (SBAR (IN After) (S (NP (NP (DT the) (NN blood)) (PP (IN in) (NP (DT the) (JJ pulmonary) (NNS capillaries)))) (VP (VBZ becomes) (VP (VBN saturated) (PP (IN with) (NP (NN oxygen))))))) (, ,) (NP (PRP it)) (VP (VBZ leaves) (NP (NP (DT the) (NNS lungs) (CC and) (NNS travels)) (PP (TO to) (NP (DT the) (NN heart))))) (. .)))