Synapses in which gap junctions allow ions to diffuse quickly from cell to cell are called synapses.

electrical synapse

Explanation:

An electrical synapse provides channel of proteins referred to as gap though which two neurons are connected. This connection allows the electrical signal to travel from cell to the other. Electrical synapses are commonly found in the brain and nervous system of an organism

In this synapse, there is a passive flow of ions from one neuron to the other through the gap junction pores. The neuron from which the current flows is called as presynaptic element and is also referred to as upstream neuron while the neuron which receives the current is called as postsynaptic or downstream neuron.  

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