( ( Metabolism ( ( ( The sum ) ( of ( all ( the ( ( ( chemical and ) energy ) reactions ) ) ) ) ) ( that ( take ( place ( in ( the ( human body ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Metabolism) (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (DT all) (DT the) (UCP (NN chemical) (CC and) (NN energy)) (NNS reactions))) (SBAR (WHNP (WDT that)) (S (VP (VBP take) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (JJ human) (NN body))))))))) (. .)))
Metabolism The sum of all the chemical and energy reactions that take place in the human body.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT all) (JJ chemical) (NNS reactions)) (SBAR (WHNP (WDT that)) (S (VP (VBP take) (NP (NN place)) (PP (IN within) (NP (DT an) (NN organism))))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (NN metabolism))))) (. .)))
The sum of all chemical reactions that take place within an organism is known as metabolism.