Now they'll regulate a few things like water concentration using contractile vacuoles, but mostly they have a pond.

现在它们会伸缩泡调节一些西，如水的浓度，但大多数情况下它们依赖一个池塘。

These drugs bind to and block the fast sodium channels that are responsible for the depolarizing phase and contractile myocytes.

这些药结合并阻断快钠通道。快钠通道作极化时相和有收缩性的心肌。

So what they find is that the uterine, the contractile event, they call it, where the uterus is actually squeezing, is actually pretty long, like 90 seconds.

他们发现，子宫的收缩过程——也就是子宫实际挤压的事件——实际上持续时间很长，大约有90秒。