Which of the following best describes the difference between chemical and electrical synapses?

• A. They both rely on neurotransmitters
• B. Chemical synapses use neurotransmitters; electrical synapses use direct electrical coupling
• C. Electrical synapses require myelin
• D. Chemical synapses have gap junctions

Answer: (B)

The main distinction is how the signal is transmitted between neurons. Chemical synapses rely on releasing neurotransmitters into a tiny gap and having those chemicals bind to receptors on the postsynaptic cell, producing a chemical and then electrical response that can be excitatory or inhibitory. Electrical synapses use gap junctions to form direct channels between two neurons, letting ions flow straight from one cell to the other for fast, often bidirectional, electrical coupling. This makes electrical transmission nearly instantaneous and highly synchronized, while chemical transmission is slower and more modifiable. So the statement that chemical synapses use neurotransmitters and electrical synapses use direct electrical coupling captures the core difference. Choices claiming electrical synapses require myelin or that chemical synapses have gap junctions don’t fit the actual mechanisms.