According to the gate-control theory, a back massage would most likely reduce your physical aches and pains by
causing the:
A) release of pain-killing endorphins in your brain.
B) activation of specific neural fibers in your spinal cord.
C) arousal of your autonomic nervous system and the release of adrenaline into your bloodstream.
D) deactivation of the pain receptors on the surface of your skin.

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