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