When conducted in neurons, it propagates in the form of electrical signals. It can spread from the stimulation site to both sides. When it reaches the prominent anterior membrane, it will release neurotransmitters, which will be accepted by the receptors on the posterior membrane, causing the next neuron to be excited or inhibited.

Therefore, the conduction of neuronal excitation is two-way.

The conduction direction on multiple neurons is unidirectional.