Thornell L E, Forsgren S
Histochem J. 1982 May;14(3):479-90. doi: 10.1007/BF01011858.
The PH sensitivity of the Ca2+-activated myosin ATPase in atrial, ventricular and conduction tissue of human hearts has been established. Heterogeneity with respect to ATPase activity is shown not only to exist between the atrial, the ventricular myocardium and the conduction system but also within both the ordinary atrial and ventricular myocardium and within the conduction system. These observations are related to the polymorphism of the myosin molecule and suggest that fibre types with different contractile properties co-exist in the human heart.
人类心脏心房、心室及传导组织中钙离子激活的肌球蛋白ATP酶的pH敏感性已得到证实。不仅在心房、心室心肌和传导系统之间存在ATP酶活性的异质性，而且在普通心房和心室心肌以及传导系统内部也存在这种异质性。这些观察结果与肌球蛋白分子的多态性有关，并表明具有不同收缩特性的纤维类型共存于人类心脏中。
