( ( ( The ( cross-sectional area ) ) ( of ( ( a muscle ) ( -LRB- ( ( rather than ) ( ( ( volume or ) length ) -RRB- ) ) ) ) ) ) ( ( determines ( ( ( the amount ) ( of force ) ) ( it ( can ( generate ( by ( defining ( ( the number ) ( of ( sarcomeres ( which ( can ( operate ( in parallel ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ cross-sectional) (NN area)) (PP (IN of) (NP (NP (DT a) (NN muscle)) (PRN (-LRB- -LRB-) (CONJP (RB rather) (IN than)) (NP (NP (NN volume)) (CC or) (NP (NN length))) (-RRB- -RRB-))))) (VP (VBZ determines) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN force))) (SBAR (S (NP (PRP it)) (VP (MD can) (VP (VB generate) (PP (IN by) (S (VP (VBG defining) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS sarcomeres)) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB operate) (PP (IN in) (NP (NN parallel))))))))))))))))))) (. .)))
The cross-sectional area of a muscle (rather than volume or length) determines the amount of force it can generate by defining the number of sarcomeres which can operate in parallel.
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN food)) (ADJP (JJ available) (PP (IN in) (NP (DT the) (NN area))))))) (ADVP (RB best)) (VP (VBZ determines) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS wolves)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB live) (PP (IN in) (NP (DT an) (NN area))))))))))) (. .)))