Which term describes chemical communication across synapses?

Which term describes chemical communication across synapses?

• A. Chemical signaling
• B. Electrical signaling
• C. Mechanical signaling
• D. Hormonal signaling

Answer: (A)

Chemical signaling is the way neurons communicate across the synapse: neurotransmitters are released from the presynaptic neuron into the synaptic cleft and bind to receptors on the postsynaptic neuron, producing a targeted chemical message that modulates the next cell’s activity. This mechanism is distinct from electrical signaling, which involves direct ion flow along membranes without a chemical messenger, and from mechanical signaling, which would rely on physical forces, or hormonal signaling, which travels through the bloodstream to affect distant targets rather than across a synapse.

Chemical signaling is the way neurons communicate across the synapse: neurotransmitters are released from the presynaptic neuron into the synaptic cleft and bind to receptors on the postsynaptic neuron, producing a targeted chemical message that modulates the next cell’s activity. This mechanism is distinct from electrical signaling, which involves direct ion flow along membranes without a chemical messenger, and from mechanical signaling, which would rely on physical forces, or hormonal signaling, which travels through the bloodstream to affect distant targets rather than across a synapse.