Acetylcholine is a neurotransmitter used at the neuromuscular junction—that means, it is the chemical that motor neurons of the nervous system release in order to activate muscles.
In the brain, acetylcholine functions as a neurotransmitter and as a neuromodulator. The brain contains a number of cholinergic areas, each with distinct functions. They play an important role in arousal, attention, memory, and motivation.
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Epinephrine, also known as adrenaline, is a hormone and neurotransmitter. It’s also sold as a drug. It increases heart rate, constricts blood vessels, dilates air passages and participates in the fight-or-flight response of the sympathetic nervous system. Chemically, epinephrine is a catecholamine, a monoamine produced only by the adrenal glands from the amino acids phenylalanine and tyrosine.
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