A patient is experiencing chronic pain and is being treated with Transcutaneous Electrical Nerve Stimulation (TENS). How do endorphins play a role in this treatment?

Endorphins block pain signals by mimicking opioid drugs.

Endorphins enhance the release of serotonin, leading to pain reduction.

Endorphins increase the production of norepinephrine to reduce pain.

Endorphins stimulate nerve cells to increase pain sensation.