Massaging the Skin or Application of an Irritant to the Skin

question 6

Multiple Choice

Massaging the skin or application of an irritant to the skin can suppress the transmission of pain signals from the corresponding body area by suppressing the sensory fibers transmitting the pain signal. Which of the following best describes this phenomenon?

• A)Release of enkephalin from local neurons in the spinal cord
• B)Presynaptic and postsynaptic inhibition of type C fibers by serotonin
• C)Lateral inhibition of pain fibers by tactile fibers from adjacent skin areas
• D)Activation of periaqueductal gray neurons

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