ESOPHAGUS

Esophagus started at the level of _______ vertebra and ended at the level of 11th thoracic vertebra (T11).

Name the opening or hole where the esophagus passing through the diaphragm?

TRUE or FALSE

Trachea located at the anterior to the esophagus?

Upper esophageal sphincter (UES) located between pharynx and esophagus. It function is to prevent ______ from the trachea to enter the esophagus.

Lower esophageal sphincter (LES) located between esophagus and stomach. It function is to prevent ______ from the stomach to flowing back (reflux) and enter the esophagus.