<prompt> Effects mediated by H1 histamine receptor includeInhibition of gastric acid secretionInduction of hepatic cytochrome P450 enzymeMaintaince of a wakeful stateVasoconstriction of aerioles  <response>: The H1 receptor is a histamine receptorbelonging to the family of rhodopsin-like G-protein-coupled receptors.This receptor is activated by the biogenic amine histamine. It is expressed in smooth muscles, on vascular endothelial cells, in the hea, and in the central nervous system. Refer kDT 7162 