Structure & Appearance
Your humerus has a smooth, cylindrical shaft that's perfectly designed to support your arm muscles!

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Your humerus has a smooth, cylindrical shaft that's perfectly designed to support your arm muscles!
When you’re walking, your cerebellum makes sure all your muscles work together in the right order, like a conductor leading an orchestra!
Your blood can fight off most germs before they make you sick, like having millions of tiny soldiers protecting you!
Every time you swallow, the muscles in your esophagus get a tiny workout — helping them stay strong and ready!
The cerebellum is an organ that’s part of your central nervous system — the command center that controls everything in your body!