Answer the following question given this paragraph: 

Some people think that gravity moves food through the esophagus. If that were true, food would move through the esophagus only when you are sitting or standing upright. In fact, because of peristalsis, food can move through the esophagus no matter what position you are in—even upside down! Just don’t try to swallow food when you are upside down—you could choke!.


Q: What process moves food through the esophagus no matter which position the body is in?


A:
peristalsis