You Are Looking at a Chemical Substance in the Brain

Multiple Choice

You are looking at a chemical substance in the brain. You know that it is involved in synaptic transmission, but it does not seem to have any direct excitatory or inhibitory effect. Rather, it seems to intensify the effect of other neurotransmitters. Most likely, you are looking at

A) an endorphin
B) a cell in the central nervous system
C) a neuromodulator
D) a reuptake trigger
E) glutamate