Lakhasly

The esophagus is a muscular tube that passes from the pharynx through the thoracic cavity and diaphragm into the abdominal cavity, where it joins the stomach.Relaxation of the sphincter allows the bolus to pass into the stomach, while contractionprevents the acidic contents of the stomach from backing upinto the esophagus.When vomiting occurs, a contraction of the abdominal muscles and diaphragm apropels the contents of the stomach upward through theesophagus.The esophagus isordinarily collapsed, but it opens and receives the boluswhen swallowing occurs.A rhythmic contraction called peristalsis, pushes thefood along the digestive tract.Peristalsis begins in the esophagus and continues in all the organs of the digestive tract.

The esophagus is a muscular tube that passes from the pharynx through the thoracic cavity and diaphragm into the abdominal cavity, where it joins the stomach. The esophagus isordinarily collapsed, but it opens and receives the boluswhen swallowing occurs.

A rhythmic contraction called peristalsis, pushes thefood along the digestive tract. Peristalsis begins in the esophagus and continues in all the organs of the digestive tract. Occåsionally, peristalsis begins even though there is no foodin the esophagus. This produces the sensation of a lump inthe throat.

The esophagus plays no role in the chemical digestion offood. Its sole purpose isconduct the food bolus from themouth to the stomach. Sphincters are muscles that encircletubes and act as valves; tubes close when sphincters contract, and they open when sphincters relax. The entrance ofthe esophagus to the stomach is marked by a constriction,often called a sphincter, although the muscle is not as developed as in a true sphincter. Relaxation of the sphincter allows the bolus to pass into the stomach, while contractionprevents the acidic contents of the stomach from backing upinto the esophagus.

Heartburn, which feels like a burning pain rising upinto the throat, occurs during reflux when some of the stomach contents escape into the esophagus. When vomiting occurs, a contraction of the abdominal muscles and diaphragm apropels the contents of the stomach upward through theesophagús.