Answer the following question given this paragraph: 

The esophagus is a long, narrow tube that carries food from the pharynx to the stomach. It has no other purpose. Food moves through the esophagus because of peristalsis. At the lower end of the esophagus, a circular muscle, called a sphincter, controls the opening to the stomach. The sphincter relaxes to let food pass into the stomach. Then the sphincter contracts to prevent food from passing back into the esophagus.


Q: What is the long, narrow tube that carries food from the pharynx to the stomach by the mechanism of peristalsis?


A:
esophagus