Which statement best describes how neurons transmit signals across synapses?

Which statement best describes how neurons transmit signals across synapses?

• A. Neurons transmit signals via action potentials along the axon; at the synapse, neurotransmitters are released to cross the gap.
• B. Electrical synapses involve generation of action potentials in postsynaptic neuron without neurotransmitters.
• C. Neurotransmitters travel along the axon as part of the action potential.
• D. Resting potential is used to transfer signals across synapse directly.

Answer: (A)

When neurons communicate, the key process is chemical signaling across the synapse. An action potential travels along the axon to the presynaptic terminal, where it triggers the release of neurotransmitters into the synaptic cleft. These chemical messengers diffuse across the gap and bind to receptors on the postsynaptic neuron, converting the signal back into an electrical response that can initiate another action potential if the signal is strong enough. This sequence—electrical signal to neurotransmitter release, neurotransmitter crossing the gap, and a postsynaptic response—is the classic way signals are transmitted across synapses. Other ideas describe different concepts, like electrical synapses where ions pass directly through gap junctions without neurotransmitters, or the misconception that neurotransmitters travel along the axon as part of the action potential, or that resting potential alone transfers signals across the synapse. The described chemical transmission across the synaptic gap best captures how signals are actually communicated between neurons.

When neurons communicate, the key process is chemical signaling across the synapse. An action potential travels along the axon to the presynaptic terminal, where it triggers the release of neurotransmitters into the synaptic cleft. These chemical messengers diffuse across the gap and bind to receptors on the postsynaptic neuron, converting the signal back into an electrical response that can initiate another action potential if the signal is strong enough. This sequence—electrical signal to neurotransmitter release, neurotransmitter crossing the gap, and a postsynaptic response—is the classic way signals are transmitted across synapses.

Other ideas describe different concepts, like electrical synapses where ions pass directly through gap junctions without neurotransmitters, or the misconception that neurotransmitters travel along the axon as part of the action potential, or that resting potential alone transfers signals across the synapse. The described chemical transmission across the synaptic gap best captures how signals are actually communicated between neurons.