Vomiting is the ejection of the stomach’s contents through the esophagus and out the mouth. Vomiting can result from excessive irritation or overdistention of the Gl tract. Reversed peristalsis, which is peristaltic contractions moving Gl tract contents backwards, precedes vomiting. Intestinal contents accumulating in the duodenum and stomach stimulate the vomiting center in the medulla oblongata. As a result, 1 contractions of the stomach begin to push the gastric contents into the esophagus as the lower esophageal sphincter relaxes: 2 a deep breath is taken and the vestibular and vocal folda close the opening of the larynx: 3 the hyoid bone and larynx are elevates, opening the upper esophageal sphincter: 4 the sofl palate elevates, closing the connection between the oropharynx and nasopharynx: 5 the diaphragm and abdominal muscles are forcefully contracted, strongly compressing the stomach and increasing the intragastric pressure: 6 the lower esophageal sphincter relaxes completely: and 7 the gastric contents are forced out of the stomach, through the esophagus and oral cavity, to the outsides.