My esophagus is my swallowing tube. It has muscles that squeeze from top to bottom to move food into my stomach. Because of these muscles, my esophagus lets me swallow when I am hanging upside down or even if I am weightless in space...

What does my esophagus look like on the inside? It is a smooth, slippery tube with a shiny, pink lining. If I swallow to much air or drink too much pop, it can let the air come back up!

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