MDCAT Physics MCQ #633

MDCAT Physics MCQ #633

1. Question 1

   Q1. A person uses a TENS (Transcutaneous Electrical Nerve Stimulation) device to alleviate pain. What is the primary mechanism of the device's action?

   • A) The device generates an electrical signal that stimulates the release of neurotransmitters involved in pain modulation.
   • B) The device generates an electrical signal that modulates the release of neurotransmitters involved in pain perception.
   • C) The device generates an electrical signal that blocks the transmission of pain signals to the brain.
   • D) The device generates an electrical signal that enhances neuronal excitability and pain perception.

   Answer: The device generates an electrical signal that blocks the transmission of pain signals to the brain.

   Explanation: The device is intended to block pain signals to the brain by generating an electrical signal that interferes with pain transmission.