Final answer:
Chemical synapses use neurotransmitters to transmit impulses and are more common in the nervous system due to their ability to regulate and produce diverse responses. Electrical synapses, although faster, lack these regulatory capabilities and are less common.
Step-by-step explanation:
Chemical synapses use neurotransmitters to transmit impulses. In a chemical synapse, a chemical signal, or neurotransmitter, is released from one neuron and affects another neuron. This transmission of chemical information allows for regulation and diverse responses, making chemical synapses more common than electrical synapses in the nervous system.
Electrical synapses, on the other hand, involve a direct connection between neurons, allowing ions to pass directly from one neuron to the next. This synapse type is faster and can be bidirectional. However, it is less common because it lacks the regulation and diversity of responses offered by chemical synapses.