rock fossils history of life
You didn't really provide any possible answers here. However, it's very easy to say that the responsible actors for impulse transmission across the synapses from one nervous cell to another nervous cell is what we call neurotransmitters. These are special molecules that can have different effects when binding onto the required receptor sites.
Detritus: "Waste or debris of any kind" (thx google)
I believe it is the red blood or platelets cell since white blood cells are trying to defend themselves
