Under normal circumstances the gag reflex and coughing prevent this from occurring; however, these protective reflexes are ... The chemoreceptor trigger zone at the base of the fourth ventricle has numerous dopamine D2 receptors, serotonin 5-HT3 ... High doses of ionizing radiation sometimes trigger a vomit reflex. Violent fits of coughing, hiccups, or asthma Anxiety ... Mechanisms of nausea and vomiting". In Tong Joo Gan; Habib, Ashraf S. (eds.). Postoperative Nausea and Vomiting: A Practical ...

The vomiting reflex (also called emesis) is thought to have evolved in many animal species as a protective mechanism against ... serotonin types 2-4 (5HT2-4), histamine type 1(H1), and acetylcholine (muscarinic receptors type 1 to 5, M1-5). Some other ... occurring 24 hours to several days after treatment) anticipatory (triggered by taste, odor, sight, thoughts, or anxiety) Risk ... Anticipatory nausea and vomiting may also occur. Nausea and vomiting may lead to further medical conditions and complications ...