What role does a first-order neuron play in the passage of a sensory signal to the brain?
A. The soma of the first-order neuron is in the cerebral cortex, and the axon terminates in the spinal cord.
B. The first-order neuron carries the signal to the sensory area of the cerebral cortex.
C. The first-order neuron detects the stimulus and transmits a signal to the spinal cord or brain-stem.
D. The first-order neuron carries the sensory signal to the thalamus.
E. The first-order neuron has no role in sensory signal transmission.
Answer: C
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