The effect this has on excitability of myocytes, however, is complex.

然而，对心肌细胞奋性是复杂。

While initial changes seem to increase myocyte excitability; further rise of potassium has the OPPOSITE effect.

初始变化可能增加心肌细胞奋性，但钾进一步升高却具有相反作用。

The result is a reduced excitability or responsiveness of the neurons and muscles in the heart.

心脏神经元和肌肉奋性或反应性降低。

This reduces the heart's excitability and suppresses reentrant tachycardia.

降低心脏奋性和抑制折返性快速性心律失常。

Now, as you may know, the binding of glutamate to the NMDA receptor results in an influx of extracellular calcium, which controls membrane excitability and synaptic transmission.

现在，如你所知，谷氨酸与NMDA受体结合内流细胞外钙，控制膜奋性和突触传递。