这是由转运分子控制的通道，转运分子到达后通道即打开。

Depolarization of the postsynaptic membrane is needed to completely open the channel.

The channel opens, but it is still not permeable for ions, because the magnesium ion blocks the passage.

...and approach the receptor sites for glutamate.

Glutamate molecules leave the synaptic vesicle...

First glutamate molecules have to be released into the synaptic cleft.

来自虚拟现实世界的场景图片：

loading 3D scene...

 

Calcium ions enter through the channel into the cytosol.

Mg++ ion leaves the channel which becomes permeable for ions.