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体内儿茶酚胺受体最早分为α、β两种,近来又将β受体分为β_1和β_2两个亚型。β_1受体使心机能亢进,脂肪分解,肠平滑肌松弛。β_2受体使气管平滑肌、血管平滑肌、子宫平滑肌松弛,肌糖元分解。当交感神经兴奋时,通过α受体使冠状血管收缩,而通过β受体又使冠状血管扩张,后者作用强于前者。交感神经的兴奋还通过β受体使窦房结自动性升高;房室结传导速
The body catecholaminergic receptor was first divided into two kinds of α, β, and β receptors were divided into β_1 and β_2 subtypes. β_1 receptor cardiac hyperthyroidism, lipolysis, intestinal smooth muscle relaxation. β_2 receptor tracheal smooth muscle, vascular smooth muscle, uterine smooth muscle relaxation, muscle glycogenolysis. When sympathetic excitement, through the α receptor to coronary vasoconstriction, but also through the β receptor and coronary vasodilation, the latter stronger than the former. Sympathetic excitement is also increased by the beta-receptor sino-atrial node autoimmune; atrioventricular node conduction velocity