since terbutaline had no effect , and phentolamine prevented the effects of both norepinephrine and epinephrine but propranolol did not , it resulted that contractility of the prostate is enhanced when the alpha-adrenoceptors are stimulated , and it is not affected by the stimulation of beta-adrenoceptors .
C0028351
norepinephrine
C0014563
epinephrine