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effectors,the locomotor system:together w the endocrine glands,muscles of the locomotor system are effectors responsible for carrying out the orders given by the nervous system.Once the muscles receive specific orders they contract by shortening their fibres,change position of bones and create movement.-skeletal system formed by 206 bones and according to their shape,they can be long short of fat.Bones join together forming joints that can be fixed,mobile,and semi mobile joints.Function of bones are anchoring the muscles,supporting the body and protecting delicate organs.-muscle system is formed of all the striated muscles of the body,which are almost 500.According to their shape they can be long flat or circular.Muscles work using a lever connected w bones to which they are joined by tendons so they are in charge of maintaining the posture of body and performing its movements.