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