Justine took a sip of milk and immediately spit it out because she realized it had soured. Which path did messages in her nervous system follow to cause this reaction?

Sensory receptors detect the unpleasant taste of the sour milk and activate sensory neurons. The signal passes to interneurons in the central nervous system, which relay it to motor neurons; the motor neurons trigger the muscles used to spit the milk out. This is the sequence sensory receptors → sensory neurons → interneurons → motor neurons, so choice B is correct.

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