( They ( ( are ( used ( as ( ( hormone regulators ) ( in ( many ( of ( ( ( ( ( ( ( ( ( human ( vital functions ) ) : ) digestion ) , ) fertility ) , ) ( blood circulation ) ) and ) ( the ( immune system ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (VP (VBN used) (PP (IN as) (NP (NP (NN hormone) (NNS regulators)) (PP (IN in) (NP (NP (JJ many)) (PP (IN of) (NP (NP (JJ human) (JJ vital) (NNS functions)) (: :) (NP (NN digestion)) (, ,) (NP (NN fertility)) (, ,) (NP (NN blood) (NN circulation)) (CC and) (NP (DT the) (JJ immune) (NN system)))))))))) (. .)))
They are used as hormone regulators in many of human vital functions: digestion, fertility, blood circulation and the immune system.
(ROOT (S (NP (NP (DT The) (JJ main) (NN function)) (PP (IN of) (NP (DT the) (JJ human) (NN digestive) (NN system)))) (VP (VBZ is) (S (VP (TO to) (VP (VB break) (PRT (RP down)) (NP (NP (NNS foods)) (PP (IN for) (NP (NN absorption)))) (PP (IN into) (NP (DT the) (NN blood))))))) (. .)))