Activation of neurons in the ______ ultimately results in ______ in the ______.
A. periacqueductal gray; depletion of substance P; periacqueductal gray
B. spinal cord; inhibition of opiate release; periacqueductal gray
C. periacqueductal gray; inhibition of substance P release; spinal cord
D. spinal cord; inhibition of substance P release; primary somatosensory cortex
Answer: C
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