Vomiting
Vomiting is the active rejection by the mouth of part of the contents of the stomach. It is a protective action of the organism which aims to protect the latter against the ingestion of toxic substances. It differs from the regurgitation which is passive and is a simple rise of the gastric contents towards the throat or the oral cavity. The mechanism of vomiting is essentially central: in the brain stem is the center of vomiting receiving information from the cortex, pressure from the cerebral ventricles, viscera and an area of chemoreceptors. It sends effusions to the digestive tract, especially to the duodenum.