Some phrases are hard to fit in meter. I blame science, and so should you. Neurotransmitter finds receptor site. Locally depolarizes the dendrite. One sends out and the next takes in.
Excitatory signals summarize.
One sends out and the next takes in. Sodium pumps and Potassium gates. At the hillock a charge accumulates. One sends out and the next takes in. It hits threshold and begins to fire.