49 神經傳遞中下列那一項可能最直接促使神經末梢之乙醯膽鹼(acetylcholine)釋放? (A)電壓門控鈉離子通道(voltage-gated sodium ion channel)打開 (B)電壓門控鉀離子通道(voltage-gated potassium ion channel) 打開 (C)電壓門控鈣離子通道(voltage-gated calcium ion channel) 打開 (D)電壓門控鎂離子通道(voltage-gated magnesium ion channel) 打開