Which of the following best describes the mechanism of the gate control theory as applied to conventional TENS?
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A
Large-diameter A-beta fibers activated by TENS close the 'gate' in the dorsal horn, inhibiting pain signal transmission
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B
Small C-fibers stimulated by TENS release substance P to block pain
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C
TENS activates descending pathways exclusively through endorphin release
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D
High-frequency TENS works by depolarizing motor neurons in the spinal cord