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