Which statement is true about the gate control theory of pain?
a. Small-diameter peripheral nerves transmit noxious stimuli to the CNS, and large-diameter peripheral nerves carry non-pain information and can inhibit nociceptor transmission in the spinal cord.
b. Sensations of all types are carried on the same size peripheral nerves. Stimulating nerve fibers with other sensations will block pain.
c. Pain stimuli are carried by large-diameter peripheral nerves. The gates on these nerves can be closed by administering analgesics.
d. Both small- and large-diameter peripheral nerves carry pain impulses. Blocking small fibers with other stimuli will reduce the speed of pain impulse transmission.
A
The gate control theory is based on the premise that pain impulses travel through either small-diameter or large-diameter nerve cells, both of which pass through the same gate. The large-diameter cells have the ability to close the gate and block transmission of the pain impulse to the brain. Stimulants such as massage, opioids, and excessive stimulation all activate the large-diameter cells to close the gate.
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