( ( Investigating ( ( the Properties ) ( of ( Muscle ( and ( Skeletal Systems ) ) ) ) ) ) . )
(ROOT (S (VP (VBG Investigating) (NP (NP (DT the) (NNPS Properties)) (PP (IN of) (NP (NNP Muscle) (CC and) (NNP Skeletal) (NNPS Systems))))) (. .)))
Investigating the Properties of Muscle and Skeletal Systems .
(ROOT (S (NP (DT The) (NN motor) (NN system)) (VP (VBZ consists) (PP (IN of) (NP (NP (NNS neurons)) (SBAR (WHNP (WDT that)) (S (VP (VBP carry) (NP (NNS signals)) (PP (TO to) (NP (JJ skeletal) (NNS muscles))))))))) (. .)))
The motor system consists of neurons that carry signals to skeletal muscles.