muscles are a part of the body & the nervous system is used for controlling the body ->  the nervous system can be used for controlling the muscles of the body  the nervous system can be used for controlling the muscles of the body & muscular movement helps animals move ->  the nervous system can be used to control the muscles of the body to help the body move  the nervous system can be used to control the muscles of the body to help the body move & the muscular system contains muscles ->  the nervous system can be used to control the muscular system of the body to help the body move  a reflex is a kind of action & movement is a kind of action ->  a reflex can be a kind of movement  the nervous system can be used to control the muscular system of the body to help the body move & a reflex can be a kind of movement ->  the nervous system can be used to control the muscular system of the body to cause a reflex  the nervous system can be used to control the muscular system of the body to cause a reflex & if two or more systems are used to cause a single action, then those systems work together to cause that action -> the muscular and nervous systems working together causes a reflex