When empty, your esophagus is flat like a deflated balloon, but it opens up like a tunnel when food comes through!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Basic Information
The scientific name for your foot is “pes,” which comes from Latin, and doctors who specialize in foot care are called podiatrists.
Basic Information
The word “artery” comes from the Greek word “arteria,” which means “air holder” because ancient Greeks thought arteries carried air!
Scientists call mitochondria the "powerhouse of the cell" because they make energy from the food you eat, just like a power station makes electricity!