Chemical synapse
Type I synapses are the more common chemical synapse in the human brain. These synapses excite (trigger) the next neuron. The next neuron produces an action potential when this synaptic transmission happens. These synapses are usually found on dendrites of the post-synaptic cell. The pre-synaptic terminal is found on the axon of the neuron that sends the transmission (pre-synaptic cell). Type I synapses are symmetrical in shape.