The dendrites accept signals generated by other neurons. These signals may be excitatory or inhibitory. All signals present at the dendrites of a neuron are combined and the result will determine whether or not that neuron will fire. If a neuron fires, an electrical impulse is generated.
An axon, or nerve fibre, is a long slender projection of a nerve cell or neuron, that conducts electrical impulses away from the neuron's cell body or soma.
Axon terminals have knob-like swellings at the very end called synaptic knobs. The function of a synaptic knob is to change the action potential that is carried by axons into a chemical message.
Therefore, the correct answer is option A.
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