Matching Pairs UNIT 1 NATURAL SCIENCE 4 PRIMARIA THE HUMAN BODY .LOCOMOTOR SYSTEMOnline version PARTES DEL APARATO LOCOMOTOR by rosi rorobar 1 your muscles contract and relax when 2 ligaments connect 3 Your muscles give your body 4 your skeleton's bones join together 5 Tendons connect 6 your skeleton protect your muscles and bones shape the bones and joints they receive messages from your brain. at joins internal organs and support your body