Peristalsis describes the involuntary wave of muscle contractions that happen naturally in your digestive tract. This automatic bodily function physically moves food and drink through your body ...

the first of a succession of hollow organs that transport their contents through muscular contractions known as peristalsis. The esophagus empties into the stomach, a large, muscular chamber that ...

The subject swallows a mouthful of barium sulfate, which is then propelled down the esophagus and into the stomach by a peristaltic contraction wave.