however , they were depressed by phentolamine ( 0.1 , 0.5 , 1.25 and 5 mum ) and yohimbine ( 0.25 , 0.5 and 5 mum ) .5 the smooth muscle contractions induced by noradrenaline and adrenaline in the terminal ileum and by phenylephrine in both the terminal and proximal ileum were antagonized by phenoxybenzamine , carbidine and phentolamine but were not influenced by yohimbine and propranolol.6 the smooth muscle relaxations of the proximal ileum induced by noradrenaline , adrenaline and ephedrine were inhibited by yohimbine , phentolamine , carbidine and phenoxybenzamine , and the isoprenaline-induced relaxation was antagonized by propranolol.7 all the agonists studied , except phenylephrine , elicited relaxations of the acetylcholine-induced sustained contraction of both proximal and terminal ileum .
C0028351
noradrenaline
C0014563
adrenaline