交感神经兴奋时,末梢释放的递质儿茶酚胺作用于效应器官细胞,引起一系列生理活动和生化反应。已发现许多具有特定分子结构的激动剂和阻滞剂虽用量极微,但能对相应的组织和器官产生显著的药理作用。为解释这些现象,提出了药物作用的受体学说。受体学说认为,药物是先通过与细胞的一些特殊受体发生 Sympathetic excitement, the release of the distal release of catecholamines acting on the effector cells, causing a series of physiological activities and biochemical reactions. A number of agonists and blockers have been found to have a specific molecular structure with minor amounts, but with significant pharmacological effects on the corresponding tissues and organs. To explain these phenomena, a receptor theory of drug action is proposed. Receptors theory that the drug is first through the cell with some special receptors