Is norepinephrine a neurotransmitter like acetylcholine? Are both excitatory?
Adrenaline is another name for epinephrine. Norepinephrine and epinephrine are both hormones. Norepinephrine is a neurotransmitter like acetylcholine. They usually have the opposite affects on different organs. However, norepinephrine and acetylcholine can both be excitatory or inhibitory, depending on what organ you’re talking about. For example, acetylcholine is inhibitory for the heart while norepinephrine is excitatory for it. On the other hand, acetylcholine stimulates or excites the intestines while norepinephrine inhibits their action. So generally, they have opposite effects from each other, but those effects are not always excitatory or always inhibitory for either of them. Epinephrine and norepinephrine are considered hormones because they are secreted by the adrenal medulla; epinephrine is made from norepinephrine there and both are secreted into the blood stream. Hope that helps… If you need more, I would (if you don’t have a good textbook to help you with this), go to wi
