单向传递(unidirectional transmission):在单根神经纤维上,兴奋是可以双向传导的,而在中枢内兴奋传布只能由传入神经元向传出神经元的方向进行,而不能逆向传布,称为单向传递。这种单向传递是由突触传递的特性所决定的。因为脊椎动物,尤其是哺乳类的中枢神经系统内的突触,绝大多数为化学性突触,其突触后膜不具备电兴奋性,动作电流不能使其兴奋,突触的传递要靠突触前末梢释放的化学递质作用于突触后膜,使突触后神经元兴奋,这样兴奋才能从前一神经元传至后一神经元。故不能逆向传布。
滚针离合器轴承是可单向传递轴和轴承座之间的扭矩,而反方向允许自由转动的一种复合功能轴承。
The needle roller clutch bearing is a kind of compound function bearing which transmits torque between the shaft and housing in one direction and allows free overrun in the opposite direction.
这导致了卡哈尔建立他的动态极化法则,这个法则表明,信息在神经元上是单向传递,从树突,经过胞体,到达轴突。
This led Cajal to formulate the law of dynamic polarization, according to which information flows in one direction through a neuron, from the dendrites, through the cell body, to the axon.
尽管从理论上讲异步消息传递是单向通信,但是可以让它调用接收应用程序中的一些功能。
Although asynchronous messaging is, in principle, a one-way communication, you can make it invoke some functionality in the receiving application.
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