( ( The kidneys ) ( ( ( ( are ( essential ( to ( ( the ( proper functioning ) ) ( of ( this system ) ) ) ) ) ) , ) ( ( ( ( ( ( ( removing ( liquid waste ) ) ( from ( ( the blood ) ( in ( ( the form ) ( of urine ) ) ) ) ) ) , ) ( maintaining ( ( ( ( a ( stable balance ) ) ( of salts ) ) and ) ( ( other substances ) ( in ( the blood ) ) ) ) ) ) , ) and ) ( producing ( ( a hormone ) ( that ( aids ( in ( ( the formation ) ( of ( red ( blood cells ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS kidneys)) (VP (VBP are) (ADJP (JJ essential) (PP (TO to) (NP (NP (DT the) (JJ proper) (NN functioning)) (PP (IN of) (NP (DT this) (NN system)))))) (, ,) (S (VP (VP (VBG removing) (NP (JJ liquid) (NN waste)) (PP (IN from) (NP (NP (DT the) (NN blood)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN urine)))))))) (, ,) (VP (VBG maintaining) (NP (NP (NP (DT a) (JJ stable) (NN balance)) (PP (IN of) (NP (NNS salts)))) (CC and) (NP (NP (JJ other) (NNS substances)) (PP (IN in) (NP (DT the) (NN blood)))))) (, ,) (CC and) (VP (VBG producing) (NP (NP (DT a) (NN hormone)) (SBAR (WHNP (WDT that)) (S (VP (VBZ aids) (PP (IN in) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (JJ red) (NN blood) (NNS cells))))))))))))) (. .)))
The kidneys are essential to the proper functioning of this system, removing liquid waste from the blood in the form of urine, maintaining a stable balance of salts and other substances in the blood, and producing a hormone that aids in the formation of red blood cells.
(ROOT (S (NP (NNP Urine)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (JJ liquid) (NN waste)) (VP (VBN formed) (PP (IN by) (NP (NNS kidneys)))))))) (. .)))