Discovery Kids: Your Muscular SystemKid's Health: Your MusclesBiology4kids: Muscular SystemKids Biology: Muscular SystemBody Zone: The Muscular SystemFact Monster: Muscular SystemScience: Human Body & MindKids Research Express: Muscle
Big Guns: The Muscular System: Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax.
