Acetylcholine
Acetylcholine is a neurohormone. When acetylcholine is injected into the bloodstream, it triggers a major parasympathetic response in the body. It decreases the heart rate, constricts the bronchioles, stimulates the gastrointestinal tract, bladder, and sweat glands. Acetylcholine also lowers blood pressure by dilating blood vessels.
References
Gever, L.N. Professional Guide to Drugs. Intermed Comm,Inc., Penn. 1981.
Haranthe, P., Akther, M., Sharif, S. Acetycholine and choline in spices. Phytother Res 1 (1987): 91-92.
Orten, J. M. and Otto W. Neuhaus. 1982. Human Biochemistry. Mosby Co. St. Louis. 984 pp.