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