the question of whether the coronary blood vessels contain an intrinsic adrenergic mechanism for vasodilatation of physiological significance has been examined in the canine heart-lung preparation with a donor by studying the response of the coronary vessels to epinephrine , norepinephrine , isoproterenol and salbutamol in combination with practolol .
C0014563
epinephrine
C0028351
norepinephrine