In response to a stimulus such as pain, a neuron sends a signal to the brain using

a. contraction and relaxation

b. electrical signals and chemical neurotransmitters

c. respiration and absorption

d. myosin and actin

The answer is b. electrical signals and chemical neurotransmitters.

Electric signals include action potential. When neurons hit threshold and action potential is triggered, the Na+ channels open and Na+ ions enter the neuron. After the depolarization of membrane, Na+ channels inactivate. Consequently, the action potential is generated.

When an action potential reaches presynaptic terminal on a neuron, it will induce a release of neurotransmitters from the neuron. Neurotransmitters pass through the synaptic cleft and bind to the receptor on a postsynaptic neuron.

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