心臟組織的傳導速度由快到慢的排列，下列何者正確？
Purkinje system＞atrial pathways＞SA node
Purkinje system＞SA node＞atrial pathways
SA node＞Purkinje system＞atrial pathways
atrial pathways＞Purkinje system＞SA node
