| A | B |
|---|
| alpha-1 | Vascular Smooth Muscle (adventitial layer) |
| alpha-2 | Presynaptic Adrenergic Nerve Terminals |
| beta-1 | Myocardium |
| beta-2 | Vascular Smooth Muscle (luminal) |
| M1 | Presynaptic Cholinergic Nerve Terminal |
| M2 | Vascular Endothelium |
| NN (NG) | Autonomic Ganglia |
| alpha-1 | Vasoconstriction |
| alpha-2 | Inhibition of Transmitter Release |
| beta-1 | Increased Inotropy and Chronotropy |
| beta-2 | Vasodilation |
| M1 | Inhibition of Transmitter Release |
| M2 | Vasodilation (via Nitric Oxide (EDRF)) |
| NN (NG) | Impulse Propagation |
| Epinephrine | alpha-1, alpha-2, beta-1, beta-2 agonist |
| Norepinephrine | alpha-1, alpha-2, beta-1 agonist |
| Phenylephrine | alpha-1 agonist |
| Isoproterenol | beta-1, beta-2 agonist |
| Acetylcholine | M1, M2 agonist |
| Hexamethonium (C6) | NN (NG): Antagonist |
| Propranolol | beta-1, beta-2 : Antagonist |
| Prazosin | alpha-1 Antagonist |
| Atropine : receptors | M1, M2 Antagonist (Slightly more M1 than M2) |
| alhpha-2 | vascular smooth muscle constriction ( minor effect) |
| Presynaptic Cholinergic Nerve Terminal | beta-2 |
| inhibition of transmitter release | beta-2 |
