- Alpha-1 (Agonist = phenylephrine)
- Vasoconstriction
- Relaxation of GI smooth muscle
- Salivary secretion
- Hepatic glycogenolysis
- Alpha-2 (Agonist = clonidine)
- Mainly presynaptic: inhibition of transmitter release (inc NA, Ach from autonomic nerves)
- Inhibits insulin
- Platelet aggregation
- Beta-1 (Agonist = dobutamine)
- Mainly located in the heart
- Increased heart rate + force
- Beta-2 (Agonist = salbutamol(Albuterol))
- Vasodilation and Bronchodilation
- Relaxation of GI smooth muscle