这是由电压控制的通道。当细胞膜上的电压降低到一定限度时,通道打开。

Finally the inactivation gate reopens (the voltage gate has earlier closed). The channel is closed, but prepared to undergo a next activity phase in case of its depolarization.

钝化门关闭。现在通道暂时关闭。这一阶段通道不能
因为细胞膜上电压的变化而重新开放。因此这一
阶段称为难控阶段。

We are looking on the inner part of the channel that faces the cell interior. Inactivation gate is still open.

钠离子通过。

When potential on the cell membrane depolarizes to above about 55mV, sodium channel opens its voltage gate.

当细胞膜去极化，电压达到55mV以上，钠离子通道开放。

来自虚拟现实世界的场景图片：

loading 3D scene...