Electrical stimulation devices

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Across
  1. 3. the T in TENS
  2. 5. electrical currents release the body's natural pain killer called...
  3. 6. this type of ultrasound causes muscles to vibrate and heat up
Down
  1. 1. the N in NMES
  2. 2. seals the gap between the electrical probe and the skin
  3. 4. electrical impulses were first discovered through this animal