In the brain and spinal cord, endorphins and enkephalins affect the pain response by:
A) increasing the activity of both A-delta fibers and C fibers.
B) decreasing the activity of both A-delta fibers and C fibers.
C) opening the gates that control the perception of pain.
D) inhibiting the transmission of pain signals, including the release of substance P.
Correct Answer:
Verified
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