One of the important thing that’s different of excitation coupling of cardiac vs skeletal. It can be modulated with different intensities of myocardial contractility from a single action potential. The duration of cardiac muscle cell contraction is about the same as the duration of the action potential. Why is that duration piece so important?
Refractory period of the muscle cell, isn’t over until the mechanical response is completed. So what’s important about thatis that tetany isn’t possible, no sustained cardiac contraction like you could for skeletal muscle. Want cyclical contraction, not one sustained cardiac contraction. Refractory period, another impulse won’t cause another muscle contraction, muscle must relax before it retracts again