Relative receptor activity of catecholamines.
Dopamine, norepinephrine, and epinephrine are physiologically active molecules known as catecholamines. Catecholamines act both as neurotransmitters and hormones vital to the maintenance of homeostasis through the autonomic nervous system. Physiologic principles of catecholamines have numerous applications within pharmacology. Different medications have different r elative receptor activity. See Table: