1. A nerve is a group of ______ bundled together.
       axons
       interneurons
       dendrites
       glialcells
2. The term neurotransmitter refers to ______
       a chemical found in thesynaptic vesicles that is released into the synapse
       any one of a number ofchemical compounds that increase the activity of the endocrinesystem
       the chemical substancefound in the cell membrane
       the DNA contained in thenucleus of every neuron
3. The fluid-filled space between the synaptic knob of one celland the dendrites of the next cell is called the___________.
       receptorsite
       synapse
       synapticknob
       axonterminal