Excitation-Contraction Coupling In Cardiac Muscle 兴奋收缩偶联 The mechanism that couples excitation-an action potential in the plasma membrane of the muscle cell- and contraction of heart muscleThe mechanism that couples excitation – an action potential in the plasma membrane of the muscle cell – and contraction of heart muscle Excitation-Contraction Coupling In Cardiac Muscle 兴奋-收缩偶联