Muscles
Muscles are special body parts that help us move, stay strong, and do everyday activities. They work by tightening and relaxing, which lets you walk, run, lift things, smile, or even blink your eyes. Your muscles are connected to your bones, and when they pull on the bones, your body moves. You have many muscles all over your body—some you can control, like the ones in your arms and legs, and some work automatically, like the muscles that help you breathe. Muscles also keep your posture straight and protect your organs by giving your body shape and support.
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