( ( ( The ( human ( musculoskeletal system ) ) ) ( -LRB- ( ( also ( known ( as ( ( ( ( ( the ( locomotor system ) ) , ) and ) previously ) ( the ( activity system ) ) ) ) ) ) -RRB- ) ) ) ( ( is ( ( an ( organ system ) ) ( that ( ( gives humans ) ( the ( ability ( to ( move ( using ( their ( muscular ( and ( skeletal systems ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ human) (JJ musculoskeletal) (NN system)) (PRN (-LRB- -LRB-) (VP (ADVP (RB also)) (VBN known) (PP (IN as) (NP (NP (DT the) (NN locomotor) (NN system)) (, ,) (CC and) (RB previously) (NP (DT the) (NN activity) (NN system))))) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT an) (NN organ) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (VBZ gives) (NP (NNS humans)) (NP (DT the) (NN ability) (S (VP (TO to) (VP (VB move) (S (VP (VBG using) (NP (PRP$ their) (JJ muscular) (CC and) (JJ skeletal) (NNS systems))))))))))))) (. .)))
The human musculoskeletal system (also known as the locomotor system, and previously the activity system) is an organ system that gives humans the ability to move using their muscular and skeletal systems.
(ROOT (S (ADVP (RB Together)) (, ,) (NP (DT the) (JJ muscular) (CC and) (JJ skeletal) (NNS organs)) (VP (VBP are) (VP (VBN known) (PP (IN as) (NP (DT the) (JJ musculoskeletal) (NN system))))) (. .)))
Together, the muscular and skeletal organs are known as the musculoskeletal system.