What is the difference between epinephrine and norepinephrine? Which locations they are secreted from?

What is the difference between epinephrine and norepinephrine? Which locations they are secreted from?
epi is a hormone that helps increase adrenaline, norepi help decrease.
Epinephrine is hormone of adrenal gland, nor-epinephrine is hormone and neurotransmitter. Nor-epinephrine produce within adrenal gland, and sympathetic postganglic adrenergic neurones of many organs such as :brain, heart, spleen...
Epinephrine and nor-epinephrine are cateholamins.
epi act on both the alpha receptors causing vasoconstiction and the beta receptors cause vasodilation...norepi acts on alpha 1 and alpha 2 receptors cause vasoconstriction...