the positive chronotropic responses to adrenaline ( 3-10 micrograms/kg ) , noradrenaline ( 3-10 micrograms/kg ) and phenylephrine ( 30-100 micrograms/kg ) produced by activating alpha 1-adrenoreceptors had a slower time course than did the chronotropic responses produced by activation of beta-adrenoreceptors .
C1372804
positive chronotropic
C0014563
adrenaline