以往一向认为,中枢向外周传递的兴奋,到神经末梢时,释放介质;释放的介质与效应器细胞膜上的特异受体结合,影响效应器的生物效应。近年来,随着电生理和生物化学的发展,尤其应用了肾上腺素能α、β受体激动剂与阻断剂作为工具,进而发现;在神经的化学传递中,至少存在着三种受体(图1)。 In the past has always been that the central transmission of excitement to the periphery, to the nerve endings, the release of media; release of the media and the effector membrane specific receptors, affecting the biological effects of the effector. In recent years, with the development of electrophysiology and biochemistry, adrenergic alpha and beta receptor agonists and blockers have been used as tools in particular. In addition, there are at least three receptors involved in chemical delivery of nerves (figure 1).