Synapse is the junction between axon of one neuron and dendrite of another neuron or the target organ. These neurons communicate with the help of chemical mediators called as “neurotransmitters,” they are known as “chemical synapses.”
If the neurons communicate by means of electrical impulses, they are known as “electrical synapses or gap junction.” Chemical synapses are the most common type of synapses, which are more complex than the fused gap junctions.
Thus, the blanks can be filled with chemical synapses; gap junction.