15. 正常心臟的搏動具有規律性與自主性，下列何者為心臟的正常「傳導 系統(conductive system)」的傳遞順序？
(A) 普金吉氏纖維(Purkinje’s fiber)→竇房結(sinoatrial node)→希氏束(His bundle)→房室結(atrioventricular node)
(B) 竇房結(sinoatrial node)→房室結(atrioventricular node)→普金吉氏纖維(Purkinje’s fiber)→希氏束(His bundle)
(C) 房室結(atrioventricular node)→竇房結(sinoatrial node)→希氏束(His bundle)→普金吉氏纖維(Purkinje’s fiber)
(D) 竇房結(sinoatrial node)→房室結(atrioventricular node) →希氏束(His bundle)→普金吉氏纖維(Purkinje’s fiber)