B.Adrenoceptors ⑧ Norepinephrine Natural agonists Epinephrine Agonists: Phenylephrine Clonidine Iso- Salbu- proterenol tamd Antagonists: Prazosin Yohimbine Atenolol Adrenergic receptors: 2 3 Go G, 4 B2 G CAMP CAMP↑ PLCp DAG PKA↑ PK↑ PKC PKA 公 当+a Hyper- Dolartzation [Ca2*] [Ca2*3↓ Hyper- polartzation [Ca2*]h↑ Inhibition of gastrointestinal motility Inhibition of d2 B2 01 exocytosis Drives heart Dilatation of Contraction of d orsecretion ·Vessels ·Blood vessels Salivary glands Bronchioles Bronchioles 。Insulin Uterus Sphincters ·Norepinephrine Renin release etc. Uterus ·Acetylcholine etc. etc