( ( After ( ( B 12 ) ( is absorbed ) ) ) ( , ( it ( ( ( ( is ( bound ( to ( serum ( protein globulins ) ) ) ) ) and ) ( is ( ( transported ( by ( the ( circulatory system ) ) ) ) ( to ( ( various tissues ) ( in ( the body ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN After) (S (NP (NNP B) (CD 12)) (VP (VBZ is) (VP (VBN absorbed))))) (, ,) (NP (PRP it)) (VP (VP (VBZ is) (VP (VBN bound) (S (VP (TO to) (VP (VB serum) (NP (NN protein) (NNS globulins))))))) (CC and) (VP (VBZ is) (VP (VBN transported) (PP (IN by) (NP (DT the) (JJ circulatory) (NN system))) (PP (TO to) (NP (NP (JJ various) (NNS tissues)) (PP (IN in) (NP (DT the) (NN body)))))))) (. .)))
After B 12 is absorbed, it is bound to serum protein globulins and is transported by the circulatory system to various tissues in the body.
(ROOT (S (NP (NP (DT A) (NN relationship)) (PP (IN between) (NP (CD two) (JJ human) (NN body) (NNS systems)))) (VP (MD could) (VP (VB be) (NP (NP (DT the) (JJ digestive) (NN system)) (SBAR (S (VP (VBZ absorbs) (NP (NP (NNS nutrients)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN transported) (PP (IN by) (NP (DT the) (JJ circulatory) (NN system)))))))))))))) (. .)))