Mitochondria can change their shape and size depending on what your cells need, like a balloon that can stretch or shrink!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Your ureters are part of your urinary system, which is the body’s natural plumbing that keeps your blood clean!
Your bones work with your immune system to fight off infections and diseases!
Your humerus works with many muscles in your shoulder and arm to help you lift, swing, bend, and rotate your arm in lots of directions!
Basic Structure & Appearance
Your nose’s scientific name is “Nasus,” and it’s made up of both soft tissue and bone to give it its unique shape!