Which statement best describes the transmission of neural messages between neurons?

Which statement best describes the transmission of neural messages between neurons?

• A. Electrochemical signaling
• B. Purely electrical signaling
• C. Mechanical signaling
• D. Optical signaling

Answer: (A)

Neural messages between neurons use electrochemical signaling. An electrical impulse travels along the presynaptic neuron as an action potential, and when it reaches the synapse, neurotransmitters are released into the synaptic cleft. These chemicals cross the gap and bind to receptors on the postsynaptic neuron, triggering a change in its membrane potential and continuing the signal electrically. This combination of electrical activity within neurons and chemical transmission across synapses is why electrochemical signaling is the correct description. Purely electrical signaling would skip the chemical step, while mechanical or optical signaling aren’t how neurons communicate.

Neural messages between neurons use electrochemical signaling. An electrical impulse travels along the presynaptic neuron as an action potential, and when it reaches the synapse, neurotransmitters are released into the synaptic cleft. These chemicals cross the gap and bind to receptors on the postsynaptic neuron, triggering a change in its membrane potential and continuing the signal electrically. This combination of electrical activity within neurons and chemical transmission across synapses is why electrochemical signaling is the correct description. Purely electrical signaling would skip the chemical step, while mechanical or optical signaling aren’t how neurons communicate.