bemesetron [ 1 alphaH,3 alphaH,5 alphaH-tropan-3-yl-3,5-dichlorobenzoate,MDL 72222,MDL 72699,MDL-72222,MDL-72699 ] does not block smooth muscle contractile responses elicited by oxytocin or mediated through serotonin D-receptors, muscarinic or nicotinic cholinoreceptors or histamine H1-receptors except at relative