1. which of the following is responsible for transmitting an impulse across a synapse to another cell?

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. 

The answer is c i just finished taking the test

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