Which of these is one reason you can distinguish between a needle prick on the foot and an ice cube on the wrist?
A. The action potentials from the needle prick are inherently different from the impulse generated by the ice cube.
B. The region of the brain to which one receptor pathway leads is different from the region to which the other pathway leads.
C. The needle prick generates a stronger action potential in any one neuron than an ice cube does.
D. The needle prick generates a higher frequency of action potentials than the ice cube does.
E. The ice cube stimulates a different class of receptors than the needle prick, even though both signals go to exactly the same location in the brain.
Answer: B
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