<prompt> Emesis receptor is -51-ITI511T251-IT35HT4  <response>: Ans. is c i.e., 5HT3 Vomiting centre and nucleus of tractus solitarius contain muscarinic, cholinergic and histamine H, receptors. CTZ is located in area postrema outside BBB and contains Dopamine D2, opioid serotonine 5-HT3 receptors. o So, antiemetic that act on vomiting centre have antimuscarinic and antihistaminic action -- can allete vomiting from any cause. o Drugs acting on CTZ have Dopamine D, antagonistic and 5-HT3 antagonistic action -- effective only in vomiting mediated by stimulation of chemoreceptors by morphine, cytotoxic drugs, digoxin. 