ESOPHAGUS
The esophagus is a muscular tube that takes
food from the pharynx to the stomach; no digestion takes place here.
Peristalsis of the esophagus propels food in one direction and ensures that
food gets to the stom-ach even if the body is horizontal or upside down. At the
junction with the stomach, the lumen (cavity) of the esophagus is surrounded by
the lower esophageal sphincter (LES or cardiac sphincter), a
circular smooth muscle. The LES
relaxes to permit food to enter the stomach, then contracts to prevent the
backup of stomach contents. If the LES does not close completely, gastric juice
may splash up into the esoph-agus; this is a painful condition we call
heartburn, or gastroesophageal reflux disease (GERD). Most people experience
heartburn once in a while, and it is merely uncomfortable, but chronic GERD is
more serious. The lining of the esophagus cannot withstand the cor-rosive
action of gastric acid and will be damaged, per-haps resulting in bleeding or
even perforation. Medications are available to treat this condition.
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