Effects of epinephrine stimulation are especially evident during stress reactions, and epinephrine is one of the major hormones involved in the stimulation of the sympathetic nervous system.
Norepinephrine, also known as noradrenaline, is both a neurotransmitter and a hormone. It plays an important role in your body’s “fight-or-flight” response.
Acetylcholine is a neurochemical that has a wide variety of functions in the brain and other organ systems of the body. Specifically, it is a neurotransmitter that acts as a chemical message that is released by neurons and allows them to communicate with one another and other specialized cells such as myocytes and cells found in glandular tissues.