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A 58-year-old woman who has experienced chronic pain for many years is fitted with a transcutaneous electrical nerve stimulator (TENS) unit. This device will
A. directly inhibit A delta and C fibers
B. inhibit nociceptors by warming the skin
C. preferentially stimulate large touch fibers
D. stimulate A delta fibers
E. stimulate nuclear bag fibers
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Well....It's all over i guess !
The right answer is *****C***** !!
The ability of a TENS unit to reduce pain may be explained by the gate control theory, which suggests that pain signals ascending from the dorsal horn are modified by large myelinated fibers (e.g., touch, or A beta, fibers). The large myelinated fibers and smaller pain fibers both project to the interneuron. Touch fibers stimulate the interneuron, which blocks transmission to the brain; pain fibers inhibit the interneuron to facilitate transmission. TENS enhances the input of touch fibers, allowing touch input to dominate over pain input and reduce the transmission of pain signals to the brain.
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are we expected to know this?
