( ( ( The amount ) of ) ( ( ( reflected and ) ( ( ( transmitted ( light correlates ) ) ( to ( the BVP ) ) ) ( as ( light ( is ( absorbed ( by ( hemoglobin ( which ( is ( ( found richly ) ( in ( the ( blood stream ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of))) (VP (VP (VBD reflected)) (CC and) (VP (VBD transmitted) (NP (JJ light) (NNS correlates)) (PP (TO to) (NP (DT the) (NNP BVP))) (SBAR (IN as) (S (NP (NN light)) (VP (VBZ is) (VP (VBN absorbed) (PP (IN by) (NP (NP (NN hemoglobin)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN found) (ADVP (RB richly)) (PP (IN in) (NP (DT the) (NN blood) (NN stream))))))))))))))) (. .)))
The amount of reflected and transmitted light correlates to the BVP as light is absorbed by hemoglobin which is found richly in the blood stream.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN light)) (VP (VBZ meets) (NP (NN matter))))) (, ,) (NP (PRP it)) (VP (MD may) (VP (VB be) (VP (VP (VBN reflected)) (, ,) (VP (VBN transmitted)) (, ,) (CC or) (VP (VBN absorbed))))) (. .)))