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S3.W31.Body parts
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They protect heart and lungs.
ribs
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It protects your brain.
skull
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It pumps blood through the body.
heart
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It tells other parts of your body what to do.
brain
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They are connected to our bones. They move our arms and legs when we jump, run or lift things.
muscles
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It is made of 33 bones. It helps you stand up tall.
spine
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They are inside your chest. When you breathe in, they fill with air.
lungs
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