Memory Game Bones, Muscles, LungsOnline version Skeletal and Muscular System by Elizabeth Lowes Jaw muscle Carbon Dioxide Strongest muscle INvoluntary muscle Food Group that builds muscle Intestines Made from Tobacco plant Oxygen Mineral that makes bones strong Calcium Protects Brain Breathe IN Cigarettes Skull ribcage Leg / Thigh bone (Femur) Protein Longest Bone Protects Heart and Lungs Breath OUT