changes in the extracellular pool of epinephrine are effected by changes in the extracellular norepinephrine concentration as in times of increased release , reuptake blockade or inhibition of degradation . alpha 2-adrenergic receptors associated with cells not necessarily in synaptic contact with the noradrenergic terminal containing epinephrine could be stimulated through this extracellular pool .
C0028351
norepinephrine
C0014563
epinephrine