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目前将心肌的交感神经受体的α受体分为α_1,α_2受体(α_1、α_2);β受体则分为β_1、β_2受体(β_1,β_2)。以往认为心肌中只有β_1受体。最近由于放射受体测定方法等的进展,已发现在大白鼠、豚鼠和兔子等动物的心肌内,4种受体的亚型都存在。众所周知,β_1受体具有影响心肌收缩力的作用和影响速率的作用,至于其它受体的生理作用尚不太
At present, the α receptors of sympathetic nerve receptors of myocardium are divided into α 1 and α 2 receptors (α 1 and α 2), β receptors are divided into β 1 and β 2 receptors (β 1 and β 2). In the past that the only β 1 receptor in myocardium. Recently, advances in radioactive receptor assay methods and the like have revealed that subtypes of four receptors exist in the myocardium of animals such as rats, guinea pigs and rabbits. As we all know, β 1 receptors have a role in the impact of myocardial contractility and the role of the rate of influence, as for the physiological role of other receptors is not too